fix: include 'x-goog-request-params' header in requests

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:e3c054a2fb85a12481c722af616c7fb6f1d02d862248385eecbec3e4240ebd1e
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/pubsub/artman_pubsub.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/js/pubsub-v1.
.eslintignore
.eslintrc.yml
.github/ISSUE_TEMPLATE/bug_report.md
.github/ISSUE_TEMPLATE/feature_request.md
.github/ISSUE_TEMPLATE/support_request.md
.jsdoc.js
.kokoro/common.cfg
.kokoro/continuous/node10/common.cfg
.kokoro/continuous/node10/docs.cfg
.kokoro/continuous/node10/lint.cfg
.kokoro/continuous/node10/samples-test.cfg
.kokoro/continuous/node10/system-test-grpcjs.cfg
.kokoro/continuous/node10/system-test.cfg
.kokoro/continuous/node10/test.cfg
.kokoro/continuous/node11/common.cfg
.kokoro/continuous/node11/test.cfg
.kokoro/continuous/node6/common.cfg
.kokoro/continuous/node6/test.cfg
.kokoro/continuous/node8/common.cfg
.kokoro/continuous/node8/test.cfg
.kokoro/docs.sh
.kokoro/lint.sh
.kokoro/presubmit/node10/common.cfg
.kokoro/presubmit/node10/docs.cfg
.kokoro/presubmit/node10/lint.cfg
.kokoro/presubmit/node10/samples-test.cfg
.kokoro/presubmit/node10/system-test-grpcjs.cfg
.kokoro/presubmit/node10/system-test.cfg
.kokoro/presubmit/node10/test.cfg
.kokoro/presubmit/node11/common.cfg
.kokoro/presubmit/node11/test.cfg
.kokoro/presubmit/node6/common.cfg
.kokoro/presubmit/node6/test.cfg
.kokoro/presubmit/node8/common.cfg
.kokoro/presubmit/node8/test.cfg
.kokoro/presubmit/windows/common.cfg
.kokoro/presubmit/windows/test.cfg
.kokoro/publish.sh
.kokoro/release/publish.cfg
.kokoro/samples-test.sh
.kokoro/system-test.sh
.kokoro/test.bat
.kokoro/test.sh
.kokoro/trampoline.sh
.nycrc
.prettierignore
.prettierrc
CODE_OF_CONDUCT.md
CONTRIBUTING.md
LICENSE
Skipping: README.md
codecov.yaml
renovate.json
synthtool > Replaced '  }\n\\s*/\\*\\*\n\\s+\\* The DNS address for this API service.' in src/v1/subscriber_client.js.
synthtool > Replaced '../../package.json' in src/v1/publisher_client.js.
synthtool > Replaced '../../package.json' in src/v1/subscriber_client.js.
synthtool > Replaced 'https:\\/\\/cloud\\.google\\.com[\\s\\*]*http:\\/\\/(.*)[\\s\\*]*\\)' in src/v1/doc/google/protobuf/doc_timestamp.js.
synthtool > Replaced 'toISOString\\]' in src/v1/doc/google/protobuf/doc_timestamp.js.

> grpc@1.19.0 install /tmpfs/src/git/autosynth/working_repo/node_modules/grpc
> node-pre-gyp install --fallback-to-build --library=static_library

node-pre-gyp WARN Using needle for node-pre-gyp https download 
[grpc] Success: "/tmpfs/src/git/autosynth/working_repo/node_modules/grpc/src/node/extension_binary/node-v57-linux-x64-glibc/grpc_node.node" is installed via remote

> protobufjs@6.8.8 postinstall /tmpfs/src/git/autosynth/working_repo/node_modules/protobufjs
> node scripts/postinstall


> @google-cloud/pubsub@0.28.1 prepare /tmpfs/src/git/autosynth/working_repo
> npm run compile


> @google-cloud/pubsub@0.28.1 compile /tmpfs/src/git/autosynth/working_repo
> tsc -p . && cp -r src/v1 build/src/ && cp -r protos build/ && cp -r proto build/ && cp smoke-test/*.js build/system-test && cp test/*.js build/test

npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.7 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.7: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

added 1137 packages from 1343 contributors and audited 7246 packages in 35.253s
found 3 vulnerabilities (1 low, 2 moderate)
  run `npm audit fix` to fix them, or `npm audit` for details

> @google-cloud/pubsub@0.28.1 fix /tmpfs/src/git/autosynth/working_repo
> eslint --fix '**/*.js' && gts fix

synthtool > Cleaned up 2 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #562 into master will increase coverage by 0.39%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #562      +/-   ##
==========================================
+ Coverage   94.83%   95.23%   +0.39%     
==========================================
  Files          16       16              
  Lines         968     1049      +81     
  Branches       86       86              
==========================================
+ Hits          918      999      +81     
  Misses         42       42              
  Partials        8        8

Impacted Files	Coverage Δ
src/v1/publisher_client.js	87.4% <100%> (+3.59%)	⬆️
src/v1/subscriber_client.js	88% <100%> (+4.1%)	⬆️

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