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

chrome/browser/ui/panels/panel_browser_frame_view.cc

Index: chrome/browser/ui/panels/panel_browser_frame_view.cc
diff --git a/chrome/browser/ui/panels/panel_browser_frame_view.cc b/chrome/browser/ui/panels/panel_browser_frame_view.cc
index dbc3bbe94f85f2013e30e55d570fd4378bb5b6f5..8548873e61b411188f2c1abc9b337375e3ff034e 100644
--- a/chrome/browser/ui/panels/panel_browser_frame_view.cc
+++ b/chrome/browser/ui/panels/panel_browser_frame_view.cc
@@ -164,10 +164,13 @@ bool PanelBrowserFrameView::MouseWatcher::IsCursorInViewBounds() const {
 }
 
 #if defined(OS_WIN)
-void PanelBrowserFrameView::MouseWatcher::WillProcessMessage(const MSG& msg) {
+base::EventStatus PanelBrowserFrameView::MouseWatcher::WillProcessEvent(
+    const base::NativeEvent& event) {
+  return base::EVENT_CONTINUE;
 }
 
-void PanelBrowserFrameView::MouseWatcher::DidProcessMessage(const MSG& msg) {
+void PanelBrowserFrameView::MouseWatcher::DidProcessEvent(
+    const base::NativeEvent& event) {
   switch (msg.message) {
     case WM_MOUSEMOVE:
     case WM_NCMOUSEMOVE:
@@ -179,6 +182,16 @@ void PanelBrowserFrameView::MouseWatcher::DidProcessMessage(const MSG& msg) {
       break;
   }
 }
+#elif defined(TOUCH_UI) || defined(USE_AURA)
+base::EventStatus PanelBrowserFrameView::MouseWatcher::WillProcessEvent(
+    const base::NativeEvent& event) {
+  return base::EVENT_CONTINUE;
+}
+
+void PanelBrowserFrameView::MouseWatcher::DidProcessEvent(
+    const base::NativeEvent& event) {
+  NOTIMPLEMENTED();
+}
 #elif defined(TOOLKIT_USES_GTK)
 void PanelBrowserFrameView::MouseWatcher::WillProcessEvent(GdkEvent* event) {
 }