Change most uses of Pickle to base::Pickle

ipc/mojo/ipc_mojo_param_traits.cc

 // Copyright 2015 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 "ipc/mojo/ipc_mojo_param_traits.h"
 
 #include "ipc/ipc_message_utils.h"
 #include "ipc/mojo/ipc_mojo_message_helper.h"
 
 namespace IPC {
 
 void ParamTraits<mojo::MessagePipeHandle>::Write(Message* m,
                                                  const param_type& p) {
   WriteParam(m, p.is_valid());
   if (p.is_valid())
     MojoMessageHelper::WriteMessagePipeTo(m, mojo::ScopedMessagePipeHandle(p));
 }
 
 bool ParamTraits<mojo::MessagePipeHandle>::Read(const Message* m,
-                                                PickleIterator* iter,
+                                                base::PickleIterator* iter,
                                                 param_type* r) {
   bool is_valid;
   if (!ReadParam(m, iter, &is_valid))
     return false;
   if (!is_valid)
     return true;
 
   mojo::ScopedMessagePipeHandle handle;
   if (!MojoMessageHelper::ReadMessagePipeFrom(m, iter, &handle))
     return false;
   DCHECK(handle.is_valid());
   *r = handle.release();
   return true;
 }
 
 void ParamTraits<mojo::MessagePipeHandle>::Log(const param_type& p,
                                                std::string* l) {
   l->append("mojo::MessagePipeHandle(");
   LogParam(p.value(), l);
   l->append(")");
 }
 
 }  // namespace IPC