Bump minSdk to 21 Bug: 322508920 Bug: 329997430 Test: presubmit (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:6cd52a5c9cb9385767732eb3bf2d3ac9ecd6e5c7) (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:38e44bf54e6069672ecf99c0f799c5dedc547872) (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:41a7a911d47460b1c1a9d83942d554d8d26ec7d4) Merged-In: I46302d5af424e666e2f666478afe9adf2b480b65 Change-Id: I46302d5af424e666e2f666478afe9adf2b480b65 
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