Change most uses of Pickle to base::Pickle

ppapi/proxy/raw_var_data_unittest.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 "ppapi/proxy/raw_var_data.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
@@ skipping 39 matching lines @@
 };
 
 bool WriteAndRead(const PP_Var& var, PP_Var* result) {
   PP_Instance dummy_instance = 1234;
   scoped_ptr<RawVarDataGraph> expected_data(RawVarDataGraph::Create(
       var, dummy_instance));
   if (!expected_data)
     return false;
   IPC::Message m;
   expected_data->Write(&m, base::Bind(&DefaultHandleWriter));
-  PickleIterator iter(m);
+  base::PickleIterator iter(m);
   scoped_ptr<RawVarDataGraph> actual_data(RawVarDataGraph::Read(&m, &iter));
   *result = actual_data->CreatePPVar(dummy_instance);
   return true;
 }
 
 // Assumes a ref for var.
 bool WriteReadAndCompare(const PP_Var& var) {
   ScopedPPVar expected(ScopedPPVar::PassRef(), var);
   PP_Var result;
   bool success = WriteAndRead(expected.get(), &result);
@@ skipping 122 matching lines @@
       ScopedPPVar::PassRef(),
       PpapiGlobals::Get()->GetVarTracker()->MakeResourcePPVar(34));
   EXPECT_TRUE(WriteReadAndCompare(resource.get()));
 
   // TODO(mgiuca): Test a host resource with an IPC::Message. It is currently a
   // checkfail to deserialize such a resource.
 }
 
 }  // namespace proxy
 }  // namespace ppapi