[Android] Update android:minSdkVersion to 19 (KitKat).

This updates the minimum SDK version to 19 (KitKat), which in practice
deprecates supports for Android Jelly Bean (SDK 16, 17, 18).

//components/cronet still needs to support Jelly Bean, so those
manifests are upgraded from SDK level 14 to 16, referring to the meta
bug for Jelly Bean support in cronet.

The WebAPK minSdkVersion will be updated in a different CL.

Bug: 923477, 922656
Change-Id: Ib1b8b4269d930a8cecb3e45d6ca3ff57f7006d00
Reviewed-on: https://chromium-review.googlesource.com/c/1423117
Reviewed-by: Peter Beverloo <[email protected]>
Reviewed-by: Ken Rockot <[email protected]>
Reviewed-by: Misha Efimov <[email protected]>
Reviewed-by: Ted Choc <[email protected]>
Reviewed-by: Bo <[email protected]>
Reviewed-by: Joe Downing <[email protected]>
Reviewed-by: agrieve <[email protected]>
Commit-Queue: Tommy Nyquist <[email protected]>
Cr-Commit-Position: refs/heads/master@{#625212}
27 files changed