Use DCHECKs when observing only a single notification.

chrome/browser/android/tab_web_contents_delegate_android.cc

 // Copyright 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/android/tab_web_contents_delegate_android.h"
 
 #include <stddef.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ skipping 147 matching lines @@
     }
   }
   return false;
 }
 
 
 void TabWebContentsDelegateAndroid::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
-  switch (type) {
-    case chrome::NOTIFICATION_FIND_RESULT_AVAILABLE:
-      OnFindResultAvailable(
-          content::Source<WebContents>(source).ptr(),
-          content::Details<FindNotificationDetails>(details).ptr());
-      break;
-    default:
-      NOTREACHED() << "Unexpected notification: " << type;
-      break;
-  }
+  DCHECK_EQ(chrome::NOTIFICATION_FIND_RESULT_AVAILABLE, type);
+  OnFindResultAvailable(
+      content::Source<WebContents>(source).ptr(),
+      content::Details<FindNotificationDetails>(details).ptr());
 }
 
 blink::WebDisplayMode TabWebContentsDelegateAndroid::GetDisplayMode(
     const WebContents* web_contents) const {
   JNIEnv* env = base::android::AttachCurrentThread();
 
   ScopedJavaLocalRef<jobject> obj = GetJavaDelegate(env);
   if (obj.is_null())
     return blink::WebDisplayModeUndefined;
 
@@ skipping 294 matching lines @@
 jboolean IsCapturingVideo(JNIEnv* env,
                           const JavaParamRef<jclass>& clazz,
                           const JavaParamRef<jobject>& java_web_contents) {
   content::WebContents* web_contents =
       content::WebContents::FromJavaWebContents(java_web_contents);
   scoped_refptr<MediaStreamCaptureIndicator> indicator =
       MediaCaptureDevicesDispatcher::GetInstance()->
           GetMediaStreamCaptureIndicator();
   return indicator->IsCapturingVideo(web_contents);
 }