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

chrome/browser/ui/views/immersive_mode_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 "chrome/browser/ui/views/immersive_mode_controller.h"
 
 #include "chrome/browser/ui/views/frame/browser_frame.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "chrome/browser/ui/views/frame/contents_container.h"
 #include "chrome/browser/ui/views/tabs/tab_strip.h"
@@ skipping 278 matching lines @@
 void ImmersiveModeController::MaybeStackViewAtTop() {
 #if defined(USE_AURA)
   if (enabled_ && revealed_ && reveal_view_.get()) {
     ui::Layer* reveal_layer = reveal_view_->layer();
     reveal_layer->parent()->StackAtTop(reveal_layer);
   }
 #endif
 }
 
 // ui::EventHandler overrides:
-ui::EventResult ImmersiveModeController::OnMouseEvent(ui::MouseEvent* event) {
+void ImmersiveModeController::OnMouseEvent(ui::MouseEvent* event) {
   if (event->type() != ui::ET_MOUSE_MOVED)
-    return ui::ER_UNHANDLED;
+    return;
   if (event->location().y() == 0) {
     // Use a timer to detect if the cursor stays at the top past a delay.
     if (!top_timer_.IsRunning()) {
       top_timer_.Start(FROM_HERE,
                        base::TimeDelta::FromMilliseconds(kRevealDelayMs),
                        this, &ImmersiveModeController::StartReveal);
     }
   } else {
     // Cursor left the top edge.
     top_timer_.Stop();
   }
   // Pass along event for further handling.
-  return ui::ER_UNHANDLED;
 }
 
 // ui::ImplicitAnimationObserver overrides:
 void ImmersiveModeController::OnImplicitAnimationsCompleted() {
   // Fired when the slide-out animation completes.
   reveal_view_.reset();  // Also removes from parent.
 }
 
 // Testing interface:
 void ImmersiveModeController::StartRevealForTest() {
@@ skipping 98 matching lines @@
 
 void ImmersiveModeController::AnimateHideRevealView() {
   ui::Layer* layer = reveal_view_->layer();
   ui::ScopedLayerAnimationSettings settings(layer->GetAnimator());
   settings.SetTweenType(ui::Tween::EASE_OUT);
   settings.AddObserver(this);  // Resets |reveal_view_| on completion.
   gfx::Transform transform;
   transform.Translate(0, -layer->bounds().height());
   layer->SetTransform(transform);
 }