Update behavior of one-click infobar to remove modal dialog, add "undo".

There are many non-signin-related files in this CL because of a method signature change.  The significant changes are in the one_click_* files.

BUG=125253
TEST=See bug description for complete UX spec.


Review URL: https://chromiumcodereview.appspot.com/10332185

git-svn-id: http://src.chromium.org/svn/trunk/src/build@139365 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -434,6 +434,10 @@
           'webui_task_manager%': 1,
         }],
 
+        ['OS=="win" or OS=="mac" or (OS=="linux" and use_aura==0)', {	
+          'enable_one_click_signin%': 1,	
+        }],
+
         ['OS=="android"', {
           'proprietary_codecs%': 1,
           'enable_webrtc%': 0,