[For trybots test] [ScreenOrientation] Hide ScreenOrientationProvider inside WebContentsImpl.

content/browser/screen_orientation/screen_orientation_delegate_android.cc

 // Copyright 2014 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 "content/browser/screen_orientation/screen_orientation_delegate_android.h"
 
 #include "content/browser/android/content_view_core_impl.h"
+#include "content/browser/screen_orientation/screen_orientation_provider.h"
 #include "jni/ScreenOrientationProvider_jni.h"
 #include "ui/android/window_android.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace content {
 
 ScreenOrientationDelegateAndroid::ScreenOrientationDelegateAndroid() {
+  ScreenOrientationProvider::SetDelegate(this);
 }
 
 ScreenOrientationDelegateAndroid::~ScreenOrientationDelegateAndroid() {
+  ScreenOrientationProvider::SetDelegate(nullptr);
 }
 
 // static
 void ScreenOrientationDelegateAndroid::StartAccurateListening() {
   Java_ScreenOrientationProvider_startAccurateListening(
       base::android::AttachCurrentThread());
 }
 
 // static
 void ScreenOrientationDelegateAndroid::StopAccurateListening() {
@@ skipping 26 matching lines @@
 }
 
 void ScreenOrientationDelegateAndroid::Unlock(WebContents* web_contents) {
   gfx::NativeWindow window = web_contents->GetTopLevelNativeWindow();
   Java_ScreenOrientationProvider_unlockOrientation(
       base::android::AttachCurrentThread(),
       window ? window->GetJavaObject() : nullptr);
 }
 
 } // namespace content