Migrate AudioFocusChangeListener to browser and always send GAIN

content/content_jni.gypi

 # 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.
 
 {
   # TODO(jrg): Update this action and other jni generators to only
   # require specifying the java directory and generate the rest.
   # TODO(jrg): when doing the above, make sure we support multiple
   # output directories (e.g. browser/jni and common/jni if needed).
   'sources': [
     'public/android/java/src/org/chromium/content/app/ChildProcessService.java',
     'public/android/java/src/org/chromium/content/app/ContentMain.java',
     'public/android/java/src/org/chromium/content/browser/accessibility/BrowserAccessibilityManager.java',
+    'public/android/java/src/org/chromium/content/browser/AudioFocusManager.java',
     'public/android/java/src/org/chromium/content/browser/BrowserStartupController.java',
     'public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java',
     'public/android/java/src/org/chromium/content/browser/ContentReadbackHandler.java',
     'public/android/java/src/org/chromium/content/browser/ContentVideoView.java',
     'public/android/java/src/org/chromium/content/browser/ContentViewCore.java',
     'public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java',
     'public/android/java/src/org/chromium/content/browser/ContentViewStatics.java',
     'public/android/java/src/org/chromium/content/browser/DeviceSensors.java',
     'public/android/java/src/org/chromium/content/browser/DownloadController.java',
     'public/android/java/src/org/chromium/content/browser/input/GamepadList.java',
@@ skipping 16 matching lines @@
     'public/android/java/src/org/chromium/content/browser/framehost/NavigationControllerImpl.java',
     'public/android/java/src/org/chromium/content/browser/webcontents/WebContentsImpl.java',
     'public/android/java/src/org/chromium/content/browser/webcontents/WebContentsObserverProxy.java',
     'public/android/java/src/org/chromium/content_public/browser/LoadUrlParams.java',
    ],
   'variables': {
     'jni_gen_package': 'content',
   },
   'includes': [ '../build/jni_generator.gypi' ],
 }