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Made the OS_LINUX ifdefs in ui/ and webkit/ directories more cross-platform, so that these files can be used on multiple POSIX platforms.

Review URL: http://codereview.chromium.org/6990051

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86742 0039d316-1c4b-4281-b951-d872f2087c98