Properly cleans up state when mouse capture changes.

ui/aura/root_window.cc

Index: ui/aura/root_window.cc
diff --git a/ui/aura/root_window.cc b/ui/aura/root_window.cc
index 48d2798693f08439b1bbd2de22737fcfa6cab4f4..79eab4ebc249bbe711f9f7a66b2226a83fb283a3 100644
--- a/ui/aura/root_window.cc
+++ b/ui/aura/root_window.cc
@@ -361,15 +361,16 @@ void RootWindow::SetCapture(Window* window) {
     // Make all subsequent mouse events and touch go to the capture window. We
     // shouldn't need to send an event here as OnCaptureLost should take care of
     // that.
-    if (mouse_pressed_handler_)
-      mouse_pressed_handler_ = capture_window_;
     if (touch_event_handler_)
       touch_event_handler_ = capture_window_;
+    if (mouse_moved_handler_ || mouse_button_flags_ != 0)
+      mouse_moved_handler_ = capture_window_;
   } else {
     // When capture is lost, we must reset the event handlers.
-    mouse_pressed_handler_ = NULL;
     touch_event_handler_ = NULL;
+    mouse_moved_handler_ = NULL;
   }
+  mouse_pressed_handler_ = NULL;
 }
 
 void RootWindow::ReleaseCapture(Window* window) {