Make GetApplicationContext return a JavaRef.

ui/base/clipboard/clipboard_android_unittest.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 "ui/base/clipboard/clipboard_android.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 26 matching lines @@
   // Simulate that another application copied something in the Clipboard
   //
   std::string new_value("Some text copied by some other app");
   using base::android::ConvertUTF8ToJavaString;
   using base::android::MethodID;
   using base::android::ScopedJavaLocalRef;
 
   JNIEnv* env = base::android::AttachCurrentThread();
   ASSERT_TRUE(env);
 
-  jobject context = base::android::GetApplicationContext();
-  ASSERT_TRUE(context);

[Theresa, 2016/08/15 17:54:14]

Why is this check no longer necessary?

-
   ScopedJavaLocalRef<jclass> context_class =
       base::android::GetClass(env, "android/content/Context");
 
   jmethodID get_system_service = MethodID::Get<MethodID::TYPE_INSTANCE>(
       env, context_class.obj(), "getSystemService",
       "(Ljava/lang/String;)Ljava/lang/Object;");
 
   // Retrieve the system service.
   ScopedJavaLocalRef<jstring> service_name =
       ConvertUTF8ToJavaString(env, "clipboard");
   ScopedJavaLocalRef<jobject> clipboard_manager(
       env,
-      env->CallObjectMethod(context, get_system_service, service_name.obj()));
+      env->CallObjectMethod(base::android::GetApplicationContext(),
+                            get_system_service, service_name.obj()));
   ASSERT_TRUE(clipboard_manager.obj() && !base::android::ClearException(env));
 
   ScopedJavaLocalRef<jclass> clipboard_class =
       base::android::GetClass(env, "android/text/ClipboardManager");
   jmethodID set_text = MethodID::Get<MethodID::TYPE_INSTANCE>(
       env, clipboard_class.obj(), "setText", "(Ljava/lang/CharSequence;)V");
   ScopedJavaLocalRef<jstring> new_value_string =
       ConvertUTF8ToJavaString(env, new_value.c_str());
 
   // Will need to call toString as CharSequence is not always a String.
@@ skipping 10 matching lines @@
 
   // Make sure the text is what we inserted while simulating the other app
   std::string contents;
   clipboard().ReadAsciiText(CLIPBOARD_TYPE_COPY_PASTE, &contents);
   EXPECT_EQ(contents, new_value);
 }
 
 }  // namespace ui
 
 #include "ui/base/clipboard/clipboard_test_template.h"