jni: Forbid inappropriate JNI parameter conversions.

mojo/runner/android/main.cc

 // Copyright 2013 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 "mojo/runner/android/main.h"
 
 #include "base/android/fifo_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
@@ skipping 96 matching lines @@
                  const JavaParamRef<jstring>& j_tmp_dir) {
   g_main_activiy.Get().Reset(env, activity);
 
   // Setting the TMPDIR environment variable so that applications can use it.
   // TODO(qsr) We will need our subprocesses to inherit this.
   int return_value =
       setenv("TMPDIR",
              base::android::ConvertJavaStringToUTF8(env, j_tmp_dir).c_str(), 1);
   DCHECK_EQ(return_value, 0);
 
-  base::android::ScopedJavaLocalRef<jobject> scoped_activity(env, activity);
-  base::android::InitApplicationContext(env, scoped_activity);
+  base::android::InitApplicationContext(env, activity);
 
   std::vector<std::string> parameters;
   parameters.push_back(
       base::android::ConvertJavaStringToUTF8(env, mojo_shell_path));
   base::android::AppendJavaStringArrayToStringVector(env, jparameters,
                                                      &parameters);
   base::CommandLine::Init(0, nullptr);
   base::CommandLine::ForCurrentProcess()->InitFromArgv(parameters);
 
   InitializeLogging();
@@ skipping 59 matching lines @@
   base::AtExitManager at_exit;
   base::CommandLine::Init(argc, argv);
 
 #if !defined(OFFICIAL_BUILD)
   base::debug::EnableInProcessStackDumping();
 #endif
 
   mojo::runner::InitializeLogging();
   return mojo::runner::ChildProcessMain();
 }