Consolidate message observer API for win and aura (and touch).

views/widget/native_widget_win.cc

Index: views/widget/native_widget_win.cc
diff --git a/views/widget/native_widget_win.cc b/views/widget/native_widget_win.cc
index a8b61b7a8f02b7f5cba0390e1a803997a7e9b3cc..1c71e78b83dff8398416f9cbc2e28914cf783390 100644
--- a/views/widget/native_widget_win.cc
+++ b/views/widget/native_widget_win.cc
@@ -1121,10 +1121,12 @@ gfx::Rect NativeWidgetWin::GetWorkAreaBoundsInScreen() const {
 ////////////////////////////////////////////////////////////////////////////////
 // NativeWidgetWin, MessageLoop::Observer implementation:
 
-void NativeWidgetWin::WillProcessMessage(const MSG& msg) {
+base::EventStatus NativeWidgetWin::WillProcessEvent(
+    const base::NativeEvent& event) {
+  return base::EVENT_CONTINUE;
 }
 
-void NativeWidgetWin::DidProcessMessage(const MSG& msg) {
+void NativeWidgetWin::DidProcessEvent(const base::NativeEvent& event) {
   RedrawInvalidRect();
 }