Change most uses of Pickle to base::Pickle

ppapi/proxy/url_loader_resource.cc

 // Copyright (c) 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 "ppapi/proxy/url_loader_resource.h"
 
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
@@ skipping 247 matching lines @@
 void URLLoaderResource::OnPluginMsgReceivedResponse(
     const ResourceMessageReplyParams& params,
     const URLResponseInfoData& data) {
   SaveResponseInfo(data);
   RunCallback(PP_OK);
 }
 
 void URLLoaderResource::OnPluginMsgSendData(
     const ResourceMessageReplyParams& params,
     const IPC::Message& message) {
-  PickleIterator iter(message);
+  base::PickleIterator iter(message);
   const char* data;
   int data_length;
   if (!iter.ReadData(&data, &data_length)) {
     NOTREACHED() << "Expecting data";
     return;
   }
 
   mode_ = MODE_STREAMING_DATA;
   buffer_.insert(buffer_.end(), data, data + data_length);
 
@@ skipping 113 matching lines @@
   }
 
   // Reset for next time.
   user_buffer_ = NULL;
   user_buffer_size_ = 0;
   return base::checked_cast<int32_t>(bytes_to_copy);
 }
 
 }  // namespace proxy
 }  // namespace ppapi