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This CL converts resource_dirs to sources for android_resources in
chrome/android/BUILD.gn file.

Details:
https://crbug.com/1026378
https://groups.google.com/a/chromium.org/forum/#!msg/chromium-dev/KAFsfaoq7y4/OC4v5sb9BQAJ

Bug: 1062263
Change-Id: I9b7b437163ac4d9529de9a18799279a8b1ee9e53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2109975
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751826}