Remove mojo::String.

ios/web/webui/mojo_facade.mm

 // Copyright 2016 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.
 
 #import "ios/web/webui/mojo_facade.h"
 
 #import <Foundation/Foundation.h>
 
 #import "base/ios/block_types.h"
 #include "base/json/json_reader.h"
@@ skipping 97 matching lines @@
     const base::DictionaryValue* args) {
   const base::Value* interface_name_as_value = nullptr;
   CHECK(args->Get("interfaceName", &interface_name_as_value));
 
   // By design interface_provider.getInterface either succeeds or crashes, so
   // check if interface name is a valid string is intentionally omitted.
   std::string interface_name_as_string;
   interface_name_as_value->GetAsString(&interface_name_as_string);
 
   mojo::MessagePipe pipe;
-  interface_provider_->GetInterface(
-      mojo::String::From(interface_name_as_string), std::move(pipe.handle0));
+  interface_provider_->GetInterface(interface_name_as_string,
+                                    std::move(pipe.handle0));
 
   return ValueFromInteger(pipe.handle1.release().value());
 }
 
 std::unique_ptr<base::Value> MojoFacade::HandleCoreClose(
     const base::DictionaryValue* args) {
   int handle = 0;
   CHECK(args->GetInteger("handle", &handle));
 
   mojo::Handle(handle).Close();
@@ skipping 134 matching lines @@
 
 std::unique_ptr<base::Value> MojoFacade::HandleSupportCancelWatch(
     const base::DictionaryValue* args) {
   int watch_id = 0;
   CHECK(args->GetInteger("watchId", &watch_id));
   watchers_.erase(watch_id);
   return nullptr;
 }
 
 }  // namespace web