Clean up unused files and update README in Fireperf.

[jeremyjiang-dev]

No description provided.

[google-oss-bot]

Coverage Report

Affected SDKs

No changes between base commit (d03a08e) and head commit (3de96d3d).

Test Logs

• Base (d03a08e3): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-check-coverage/1354490858723872769
• Head (3de96d3d): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/2365/check-coverage-changed/1354506462709157894

Notes

HTML coverage reports can be produced locally with ./gradlew <product>:checkCoverage.
Report files are located at <product-build-dir>/reports/jacoco/.

Head commit (3de96d3d) is created by Prow via merging commits: d03a08e b5a9b4b.

[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (d03a08e) and head commit (3de96d3d).

Test Logs

• Base (d03a08e3): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-binary-size/1354490858723872770
• Head (3de96d3d): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/2365/binary-size/1354506462709157888

Notes

Head commit (3de96d3d) is created by Prow via merging commits: d03a08e b5a9b4b.

[ramanpreetSinghKhinda]

I think we need proguard file. Isn't it?

https://github.com/FirebasePrivate/firebase-android-release/blob/master/firebase-perf/proguard-rules.pro

[visumickey]

@jeremyjiang-dev Where did these files from at the first place? Atleast the crash dump.

[jeremyjiang-dev]

@jeremyjiang-dev Where did these files from at the first place? Atleast the crash dump.

Discussed offline. This file is generated accidentally on my machine and it is fine to remove it.

[jeremyjiang-dev]

I think we need proguard file. Isn't it?

https://github.com/FirebasePrivate/firebase-android-release/blob/master/firebase-perf/proguard-rules.pro

The content in this file is all commented out. It is fine to remove it.