Add context_utils.h includes where needed.

android_webview/native/android_protocol_handler.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 "android_webview/native/android_protocol_handler.h"
 
 #include "android_webview/browser/net/android_stream_reader_url_request_job.h"
 #include "android_webview/browser/net/aw_url_request_job_factory.h"
 #include "android_webview/common/url_constants.h"
 #include "android_webview/native/input_stream_impl.h"
+#include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/jni_weak_ref.h"
 #include "content/public/common/url_constants.h"
 #include "jni/AndroidProtocolHandler_jni.h"
 #include "net/base/io_buffer.h"
 #include "net/base/mime_util.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
 #include "net/http/http_util.h"
@@ skipping 268 matching lines @@
   return ConvertUTF8ToJavaString(env, android_webview::kAndroidAssetPath);
 }
 
 static ScopedJavaLocalRef<jstring> GetAndroidResourcePath(
     JNIEnv* env,
     const JavaParamRef<jclass>& /*clazz*/) {
   return ConvertUTF8ToJavaString(env, android_webview::kAndroidResourcePath);
 }
 
 }  // namespace android_webview