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To keep the generated makefiles relatively stable, we sort a number of
file lists at gyp time, but this sort ordering is dependent on the
calling user's locale. Fix this by forcing LC_COLLATE to "C" in
gyp_webview.

BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/649633002

Cr-Commit-Position: refs/heads/master@{#299103}