Remove shrinkMode attribute

[vkryachko]

Removed as per discussion in https://issuetracker.google.com/issues/221423396

[google-oss-bot]

Size Report ¹

Affected Products

• firebase-common

  Type	Base (14f26b8)	Merge (2f694e4)	Diff
  aar	48.5 kB	48.5 kB	-13 B (-0.0%)
  apk (release)	681 kB	681 kB	-12 B (-0.0%)

Test Logs

• Base (14f26b8): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-binary-size/1516874063320977408
• Merge (2f694e4): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3672/binary-size/1517172783090503684

Notes

• Commit (2f694e4) is created by Prow via merging PR base commit (14f26b8) and head commit (fb8f91c).

1. https://storage.googleapis.com/firebase-sdk-metric-reports/QwfCzq8DT6.html

[google-oss-bot]

Coverage Report ¹

Affected Products

No changes between base commit (14f26b8) and merge commit (2f694e4).

Test Logs

• Base (14f26b8): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-check-coverage/1516874063316783107
• Merge (2f694e4): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3672/check-coverage-changed/1517172783090503683

Notes

• Commit (2f694e4) is created by Prow via merging PR base commit (14f26b8) and head commit (fb8f91c).
• 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/45FwHv0tUD.html

[google-oss-bot]

@vkryachko: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
device-check-changed	fb8f91c	link	/test device-check-changed

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