events: Update key-event handlers to not return EventResult.

ash/tooltips/tooltip_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/tooltips/tooltip_controller.h"
 
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
@@ skipping 231 matching lines @@
   }
 }
 
 void TooltipController::SetTooltipsEnabled(bool enable) {
   if (tooltips_enabled_ == enable)
     return;
   tooltips_enabled_ = enable;
   UpdateTooltip(tooltip_window_);
 }
 
-ui::EventResult TooltipController::OnKeyEvent(ui::KeyEvent* event) {
+void TooltipController::OnKeyEvent(ui::KeyEvent* event) {
   // On key press, we want to hide the tooltip and not show it until change.
   // This is the same behavior as hiding tooltips on timeout. Hence, we can
   // simply simulate a timeout.
   if (tooltip_shown_timer_.IsRunning()) {
     tooltip_shown_timer_.Stop();
     TooltipShownTimerFired();
   }
-  return ui::ER_UNHANDLED;
 }
 
 ui::EventResult TooltipController::OnMouseEvent(ui::MouseEvent* event) {
   aura::Window* target = static_cast<aura::Window*>(event->target());
   switch (event->type()) {
     case ui::ET_MOUSE_MOVED:
     case ui::ET_MOUSE_DRAGGED:
       if (tooltip_window_ != target) {
         if (tooltip_window_)
           tooltip_window_->RemoveObserver(this);
@@ skipping 209 matching lines @@
 }
 
 TooltipController::Tooltip* TooltipController::GetTooltip() {
   if (!tooltip_.get())
     tooltip_.reset(new Tooltip(this));
   return tooltip_.get();
 }
 
 }  // namespace internal
 }  // namespace ash