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Move the build targets to //third_party/android_sdk.
Move files for android_platform into //third_party/android_platform.

Tbr for build target renaming.

Tbr: thakis@chromium.org
Bug: 947060
Change-Id: I1ec7117b042a2bfe22c6dbc7985256465318cab7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1543468
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645538}