This removes the need of executing Chromium's runhooks.
A selection of hooks (not all) were picked that should be
sufficient for WebRTC's needs.
New dependencies:
* third_party/espresso
* third_party/javax_inject
* tools/clang_format_merge_driver
BUG=webrtc:5578, webrtc:5006, webrtc:6741
TESTED=
rm -rf third_party/android_tools/sdk/extras/google/m2repository/
gclient runhooks
Verified that third_party/android_tools/sdk/extras/google/m2repository/ is downloaded without any license prompt.
NOTRY=True
Review-Url: https://codereview.webrtc.org/2524673002
Cr-Commit-Position: refs/heads/master@{#15195}
