Exclude some files from unit_tests build on Android
Exclude some files from unit_tests build on Android

Themes are being disabled for the Android build (9515010) so we
shouldn't run those tests. Similarly, shell_integration is just stubs
on Android.

BUG=117407
TEST=


Review URL: http://codereview.chromium.org/9647002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@125769 0039d316-1c4b-4281-b951-d872f2087c98

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