tree 8b52d6a2f636d8dfde763860e6823a9f14b840eb
parent f61eaa8b06c7b1c5fe8eb00af72e1ed18d58f791
author tfarina <tfarina@chromium.org> 1448991665 -0800
committer Commit bot <commit-bot@chromium.org> 1448991771 +0000

tools/gn: make use of base's StartsWith() function

Since Brett introduced this funtion to base, we can make use of it and
remove our copy from gn. We are also making use of it in other five
files already.

BUG=None
TEST=gn gen + gn_unittests
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/1481403006

Cr-Original-Commit-Position: refs/heads/master@{#362446}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 934d88d64c50f9f4d684194320cf15cd9b29059e