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This adds utility classes ApiHelperForM in android_webview/glue and
content/browser/selection. It moves references to
WebResourceErrorAdapter and FloatingActionModeCallback into these
utility classes. On L devices, this reduces logspam caused by class
verification on startup.

Bug: 791099, 838702
Test: adb logcat | grep 'Rejecting re-init on previously-failed class'
Change-Id: I3c5f096d58fbe710c6429f48b8cc11268683af0d
Reviewed-on: https://chromium-review.googlesource.com/1100048
Commit-Queue: James Wallace-Lee <jamwalla@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567771}