Remove stops_event_propagation from Window, since it's broken.

ash/ash.gyp

Index: ash/ash.gyp
===================================================================
--- ash/ash.gyp	(revision 128508)
+++ ash/ash.gyp	(working copy)
@@ -188,6 +188,8 @@
         'wm/default_window_resizer.h',
         'wm/dialog_frame_view.cc',
         'wm/dialog_frame_view.h',
+        'wm/event_client_impl.cc',
+        'wm/event_client_impl.h',
         'wm/frame_painter.cc',
         'wm/frame_painter.h',
         'wm/image_grid.cc',
@@ -425,9 +427,13 @@
         'shell/app_list.cc',
         'shell/bubble.cc',
         'shell/example_factory.h',
+        'shell/launcher_delegate_impl.cc',
+        'shell/launcher_delegate_impl.h',
         'shell/lock_view.cc',
         'shell/panel_window.cc',
         'shell/panel_window.h',
+        'shell/shell_delegate_impl.cc',
+        'shell/shell_delegate_impl.h',
         'shell/shell_main.cc',
         'shell/shell_main_parts.cc',
         'shell/shell_main_parts.h',
@@ -437,6 +443,8 @@
         'shell/widgets.cc',
         'shell/window_type_launcher.cc',
         'shell/window_type_launcher.h',
+        'shell/window_watcher.cc',
+        'shell/window_watcher.h',
         '<(SHARED_INTERMEDIATE_DIR)/ui/gfx/gfx_resources.rc',
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources_standard/ui_resources_standard.rc',
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources/ui_resources.rc',