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The write_file function should only actually update the file contents if the contents have changed to avoid unnecessary rebuilds of targets that depend on the written file.

R=thakis@chromium.org

Review URL: https://codereview.chromium.org/301973005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273855 0039d316-1c4b-4281-b951-d872f2087c98