base: Do not allow MessagePumpObservers to consume events.

chrome/browser/ui/views/tabs/tab_drag_controller.cc

Index: chrome/browser/ui/views/tabs/tab_drag_controller.cc
diff --git a/chrome/browser/ui/views/tabs/tab_drag_controller.cc b/chrome/browser/ui/views/tabs/tab_drag_controller.cc
index 47bc0f09cc17e786cf45ada64e15a9baf8c6c349..10a7c0aa15e390d45e840dfa22708904107dac38 100644
--- a/chrome/browser/ui/views/tabs/tab_drag_controller.cc
+++ b/chrome/browser/ui/views/tabs/tab_drag_controller.cc
@@ -493,10 +493,7 @@ void TabDragController::Observe(
 ///////////////////////////////////////////////////////////////////////////////
 // TabDragController, MessageLoop::Observer implementation:
 
-base::EventStatus TabDragController::WillProcessEvent(
-    const base::NativeEvent& event) {
-  return base::EVENT_CONTINUE;
-}
+void TabDragController::WillProcessEvent(const base::NativeEvent& event) {}
 
 void TabDragController::DidProcessEvent(const base::NativeEvent& event) {
   // If the user presses ESC during a drag, we need to abort and revert things