Update Javadoc references from gcm to fcm.

[gsakakihara]

No description provided.

[google-oss-bot]

Coverage Report ¹

Affected Products

• firebase-messaging

  Overall coverage changed from 85.40% (055df3e) to 85.56% (9d2354a) by +0.16%.

  Filename	Base (055df3e)	Merge (9d2354a)	Diff
  MessagingAnalytics.java	81.38%	83.00%	+1.62%

Test Logs

• Base (055df3e): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-check-coverage/1491446578295083009
• Merge (9d2354a): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3425/check-coverage-changed/1491465393233989633

Notes

• Commit (9d2354a) is created by Prow via merging PR base commit (055df3e) and head commit (a752e6d).
• Run gradle <product>:checkCoverage to produce HTML coverage reports locally. After gradle commands finished, report files can be found under <product-build-dir>/reports/jacoco/.

1. https://storage.googleapis.com/firebase-sdk-metric-reports/jAJXZ5dGbw.html

[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (055df3e) and merge commit (9d2354a).

Test Logs

• Base (055df3e): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-binary-size/1491446578295083010
• Merge (9d2354a): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3425/binary-size/1491465393238183937

Notes

• Commit (9d2354a) is created by Prow via merging PR base commit (055df3e) and head commit (a752e6d).

1. https://storage.googleapis.com/firebase-sdk-metric-reports/Qgm440OOHC.html

[willxu-google]

LGTM