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I also changed the signature of ui::ThemeProvider::GetDisplayProperty() because most of the callers were ignoring the return value. In some cases we were using uninitialized variables because of this.

BUG=279978
TEST=Manual, see bug
R=erg
TBR=sky (For trivial refactor)

Review URL: https://chromiumcodereview.appspot.com/23614007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@220537 0039d316-1c4b-4281-b951-d872f2087c98