Revert of Convert sticky keys to a chromeos::EventRewriter phase.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 2c393065aba614f7c7caa01fa365b5f490a2a9c8..c8b327979249e3eaabbad01a31fc24a65b6edf96 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -889,6 +889,13 @@
 
   // The order in which event filters are added is significant.
 
+#if defined(OS_CHROMEOS)
+  // The StickyKeysController also rewrites events and must be added
+  // before observers, but after the EventRewriterEventFilter.
+  sticky_keys_controller_.reset(new StickyKeysController);
+  AddPreTargetHandler(sticky_keys_controller_.get());
+#endif
+
   // wm::UserActivityDetector passes events to observers, so let them get
   // rewritten first.
   user_activity_detector_.reset(new ::wm::UserActivityDetector);
@@ -921,10 +928,6 @@
   // created.
 #if defined(OS_CHROMEOS)
     keyboard::InitializeKeyboard();
-#endif
-
-#if defined(OS_CHROMEOS)
-  sticky_keys_controller_.reset(new StickyKeysController);
 #endif
 
   lock_state_controller_.reset(new LockStateController);