We would like to share the event handling logic of RenderWidgetHostViewAura with RenderWidgetHostViewMus. As a first step this change refactors the EventHandler code out of RenderWidgetHostViewAura into its own class

TEST=manually run browser, dry-run of CQ to verify all existing tests.
BUG=631270

Review-Url: https://chromiumcodereview.appspot.com/2317333002
Cr-Commit-Position: refs/heads/master@{#426815}
diff --git a/content/browser/renderer_host/DEPS b/content/browser/renderer_host/DEPS
index 79ab5a9..1f30760 100644
--- a/content/browser/renderer_host/DEPS
+++ b/content/browser/renderer_host/DEPS
@@ -39,6 +39,9 @@
   "render_widget_host_view_aura\.cc": [
     "+content/browser/frame_host",
   ],
+  "render_widget_host_view_event_handler\.cc": [
+    "+content/browser/frame_host",
+  ],
   # TODO(kenrb): RenderWidgetHostViewChildFrame should eventually be moved
   # to content/renderer_host, at which time this can be removed.
   "render_widget_host_input_event_router.cc": [