Use a direct include of strings headers in content/browser/, part 2.

content/browser/tracing/trace_controller_impl.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 "content/browser/tracing/trace_controller_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
-#include "base/string_number_conversions.h"
+#include "base/strings/string_number_conversions.h"
 #include "content/browser/tracing/trace_message_filter.h"
 #include "content/browser/tracing/trace_subscriber_stdio.h"
 #include "content/common/child_process_messages.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "content/public/common/content_switches.h"
 
 using base::debug::TraceLog;
 
 namespace content {
 
@@ skipping 377 matching lines @@
     // The last ack represents local trace, so we need to ack it now. Note that
     // this code only executes if there were child processes.
     float bpf = TraceLog::GetInstance()->GetBufferPercentFull();
     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
         base::Bind(&TraceControllerImpl::OnTraceBufferPercentFullReply,
                    base::Unretained(this), bpf));
   }
 }
 
 }  // namespace content