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Add kWebViewJavaJsBridgeMojo feature for Android WebView, to
enable/disable the new Java/JS bridge code path using mojo. The feature
is currently disabled by default. When the feature is enabled the mojo
interface for the addJavascriptInterface() API in Android WebView is
used.

This CL also adds the feature to the ProductionSupportedFlagList and
removes the 1-arg version of JavascriptInjector.fromWebContents().

BUG=1164434

Change-Id: Ic4ecdbb78ca18e5455ddbac3367ddbe301bdb67e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2630905Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Tim Volodine <timvolodine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844856}