Revert r9953 since it caused regressions like:

chrome/views/root_view.cc

Index: chrome/views/root_view.cc
===================================================================
--- chrome/views/root_view.cc	(revision 10904)
+++ chrome/views/root_view.cc	(working copy)
@@ -269,19 +269,8 @@
 }
 
 bool RootView::OnMousePressed(const MouseEvent& e) {
-  static View* last_click_handler = 0;
-
-  // This function is not to handle non-client messages, so we return that
-  // we are not handling it quickly except for the double-click because we
-  // need to absorb it when it occurs on a different view than its single
-  // click part.
-  if ((e.GetFlags() & MouseEvent::EF_IS_NON_CLIENT) &&
-      !(e.GetFlags() & MouseEvent::EF_IS_DOUBLE_CLICK)) {
-    last_click_handler = 0;
-    return false;
-  }
-
   UpdateCursor(e);
+
   SetMouseLocationAndFlags(e);
 
   // If mouse_pressed_handler_ is non null, we are currently processing
@@ -311,8 +300,6 @@
     const MouseEvent mouse_pressed_event(e, this, mouse_pressed_handler_);
     drag_info.Reset();
     const bool handled =
-        (!(e.GetFlags() & MouseEvent::EF_IS_DOUBLE_CLICK) ||
-        (mouse_move_handler_ == last_click_handler)) &&
         mouse_pressed_handler_->ProcessMousePressed(mouse_pressed_event,
                                                     &drag_info);
 
@@ -329,10 +316,8 @@
     // If the view handled the event, leave mouse_pressed_handler_ set and
     // return true, which will cause subsequent drag/release events to get
     // forwarded to that view.
-    if (handled) {
-      last_click_handler = mouse_pressed_handler_;
+    if (handled)
       return true;
-    }
   }
 
   // Reset mouse_pressed_handler_ to indicate that no processing is occurring.
@@ -348,15 +333,6 @@
     NOTIMPLEMENTED();
 #endif
   }
-
-  // If we go through the whole hierarchy and we did not find the same handler
-  // for the double-click as we did for the single-click, then mark it as
-  // handled to eat up any double-click that ends up in a different location
-  // than its single-click part.
-  if (last_click_handler && e.GetFlags() & MouseEvent::EF_IS_DOUBLE_CLICK)
-    hit_disabled_view = true;
-
-  last_click_handler = 0;
   return hit_disabled_view;
 }