Make GetApplicationContext return a JavaRef.

ui/base/clipboard/clipboard_android.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 "ui/base/clipboard/clipboard_android.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_string.h"
 #include "base/lazy_instance.h"
 #include "base/stl_util.h"
@@ skipping 46 matching lines @@
   void UpdateFromAndroidClipboard();
   std::map<std::string, std::string> map_;
   base::Lock lock_;
 
   // Java class and methods for the Android ClipboardManager.
   ScopedJavaGlobalRef<jobject> clipboard_manager_;
 };
 base::LazyInstance<ClipboardMap>::Leaky g_map = LAZY_INSTANCE_INITIALIZER;
 
 ClipboardMap::ClipboardMap() {
-  JNIEnv* env = AttachCurrentThread();
-  DCHECK(env);
-
-  // Get the context.
-  jobject context = base::android::GetApplicationContext();
-  DCHECK(context);
-
-  clipboard_manager_.Reset(Java_Clipboard_create(env, context));
+  clipboard_manager_.Reset(Java_Clipboard_create(
+      AttachCurrentThread(), base::android::GetApplicationContext()));
   DCHECK(clipboard_manager_.obj());
 }
 
 std::string ClipboardMap::Get(const std::string& format) {
   base::AutoLock lock(lock_);
   UpdateFromAndroidClipboard();
   std::map<std::string, std::string>::const_iterator it = map_.find(format);
   return it == map_.end() ? std::string() : it->second;
 }
 
@@ skipping 380 matching lines @@
   g_map.Get().Set(kBitmapFormat, packed);
 }
 
 void ClipboardAndroid::WriteData(const Clipboard::FormatType& format,
                                  const char* data_data,
                                  size_t data_len) {
   g_map.Get().Set(format.ToString(), std::string(data_data, data_len));
 }
 
 } // namespace ui