Upstream most of the iOS WebUI support in ios/web/

ios/public/provider/web/web_ui_ios_message_handler.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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/public/browser/web_ui_message_handler.h"
+#include "ios/public/provider/web/web_ui_ios_message_handler.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 
-namespace content {
+namespace web {
 
-bool WebUIMessageHandler::ExtractIntegerValue(const base::ListValue* value,
-                                              int* out_int) {
+bool WebUIIOSMessageHandler::ExtractIntegerValue(const base::ListValue* value,
+                                                 int* out_int) {
   std::string string_value;
   if (value->GetString(0, &string_value))
     return base::StringToInt(string_value, out_int);
   double double_value;
   if (value->GetDouble(0, &double_value)) {
     *out_int = static_cast<int>(double_value);
     return true;
   }
   NOTREACHED();
   return false;
 }
 
-bool WebUIMessageHandler::ExtractDoubleValue(const base::ListValue* value,
-                                             double* out_value) {
+bool WebUIIOSMessageHandler::ExtractDoubleValue(const base::ListValue* value,
+                                                double* out_value) {
   std::string string_value;
   if (value->GetString(0, &string_value))
     return base::StringToDouble(string_value, out_value);
   if (value->GetDouble(0, out_value))
     return true;
   NOTREACHED();
   return false;
 }
 
-base::string16 WebUIMessageHandler::ExtractStringValue(
+base::string16 WebUIIOSMessageHandler::ExtractStringValue(
     const base::ListValue* value) {
   base::string16 string16_value;
   if (value->GetString(0, &string16_value))
     return string16_value;
   NOTREACHED();
   return base::string16();
 }
 
-}  // namespace content
+}  // namespace web