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This is shorter, and it allows us to remove two trampoline files on Android
(which still weren't updated to trampoline to the 4.8 toolchain and still
referred to the 4.6 toolchain instead).

No intended visible behavior change.

BUG=none

Review URL: https://codereview.chromium.org/450843002

Cr-Commit-Position: refs/heads/master@{#288424}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288424 0039d316-1c4b-4281-b951-d872f2087c98