Cherrypick: [android_webview] Fix Android.mk module dependencies.

Cherrypick Chromium r280319 to fix constant rebuilds of
android_webview_java:

> LOCAL_ADDITIONAL_DEPENDENCIES works on the file level, not phony
> target level, so the current rule results in rebuilding the
> android_webview_java target whenever we run make.
>
> BUG=389534
> TEST=compile on android_aosp bot
> NOTRY=true
>
> Review URL: https://codereview.chromium.org/332343007
>
> git-svn-id: svn://svn.chromium.org/chrome/trunk/src@280319 0039d316-1c4b-4281-b951-d872f2087c98

Bug: 15598761
Change-Id: I6a1da1a1ee829e962ada76107fb0109aac0c8da5
1 file changed