Implement fullscreen info bubble on Win and Mac.

When a site enters fullscreen a bubble should appear, both to give the user the option to exit fullscreen and to inform them that the site has entered fullscreen. This patch implements that behaviour on Windows and Mac.

XIB changes: (FullScreenExitBubble.xib)
* Added explanatory text field.
* Added "allow" and "deny" buttons.
* Changed from View into Window.

BUG=73923
TEST=

Review URL: http://codereview.chromium.org/7740044

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@105649 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index d5b190e0..f52c526 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -4412,6 +4412,7 @@
                   'app/nibs/ExtensionInstalledBubble.xib',
                   'app/nibs/FirstRunBubble.xib',
                   'app/nibs/FirstRunDialog.xib',
+                  'app/nibs/FullScreenExitBubble.xib',
                   'app/nibs/GlobalErrorBubble.xib',
                   'app/nibs/HttpAuthLoginSheet.xib',
                   'app/nibs/HungRendererDialog.xib',