Files.app: Prevent the maximize/close buttons in the gallery view from stealing the focus.

Along the way, this CL match their styles to the normal view's styles.

BUG=305928
TEST=manually

Review URL: https://codereview.chromium.org/26805002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228134 0039d316-1c4b-4281-b951-d872f2087c98
Media Galleries: Simplify Picasa API tests a little bit.

Review URL: https://codereview.chromium.org/26954003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228135 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228135