Rename DesktopEngagement* to DesktopSessionDuration*.

chrome/browser/metrics/desktop_engagement/desktop_engagement_observer.cc

Index: chrome/browser/metrics/desktop_engagement/desktop_engagement_observer.cc
diff --git a/chrome/browser/metrics/desktop_engagement/desktop_engagement_observer.cc b/chrome/browser/metrics/desktop_engagement/desktop_engagement_observer.cc
deleted file mode 100644
index bf4dda506a1497d4808b5de3f1fd1a80eebb4b6b..0000000000000000000000000000000000000000
--- a/chrome/browser/metrics/desktop_engagement/desktop_engagement_observer.cc
+++ /dev/null
@@ -1,64 +0,0 @@
-// Copyright 2016 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/metrics/desktop_engagement/desktop_engagement_observer.h"
-
-#include "chrome/browser/metrics/desktop_engagement/desktop_engagement_service.h"
-#include "content/public/browser/render_view_host.h"
-
-DEFINE_WEB_CONTENTS_USER_DATA_KEY(metrics::DesktopEngagementObserver);
-
-namespace metrics {
-
-DesktopEngagementObserver::DesktopEngagementObserver(
-    content::WebContents* web_contents,
-    DesktopEngagementService* service)
-    : content::WebContentsObserver(web_contents), service_(service) {
-  RegisterInputEventObserver(web_contents->GetRenderViewHost());
-}
-
-DesktopEngagementObserver::~DesktopEngagementObserver() {}
-
-// static
-DesktopEngagementObserver* DesktopEngagementObserver::CreateForWebContents(
-    content::WebContents* web_contents) {
-  DCHECK(web_contents);
-
-  if (!DesktopEngagementService::IsInitialized())
-    return nullptr;
-
-  DesktopEngagementObserver* observer = FromWebContents(web_contents);
-  if (!observer) {
-    observer = new DesktopEngagementObserver(web_contents,
-                                             DesktopEngagementService::Get());
-    web_contents->SetUserData(UserDataKey(), observer);
-  }
-  return observer;
-}
-
-void DesktopEngagementObserver::RegisterInputEventObserver(
-    content::RenderViewHost* host) {
-  if (host != nullptr)
-    host->GetWidget()->AddInputEventObserver(this);
-}
-
-void DesktopEngagementObserver::UnregisterInputEventObserver(
-    content::RenderViewHost* host) {
-  if (host != nullptr)
-    host->GetWidget()->RemoveInputEventObserver(this);
-}
-
-void DesktopEngagementObserver::OnInputEvent(
-    const blink::WebInputEvent& event) {
-  service_->OnUserEvent();
-}
-
-void DesktopEngagementObserver::RenderViewHostChanged(
-    content::RenderViewHost* old_host,
-    content::RenderViewHost* new_host) {
-  UnregisterInputEventObserver(old_host);
-  RegisterInputEventObserver(new_host);
-}
-
-}  // namespace metrics