Move platform_thread to base/threading and put in the base namespace. I left ...

chrome/browser/errorpage_uitest.cc

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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 "base/string_util.h"
+#include "base/threading/platform_thread.h"
 #include "chrome/test/automation/tab_proxy.h"
 #include "chrome/test/ui/ui_test.h"
 #include "chrome/browser/net/url_request_failed_dns_job.h"
 #include "chrome/browser/net/url_request_mock_http_job.h"
 #include "net/test/test_server.h"
 
 class ErrorPageTest : public UITest {
  protected:
   bool WaitForTitleMatching(const std::wstring& title) {
     for (int i = 0; i < 10; ++i) {
       if (GetActiveTabTitle() == title)
         return true;
-      PlatformThread::Sleep(sleep_timeout_ms());
+      base::PlatformThread::Sleep(sleep_timeout_ms());
     }
     EXPECT_EQ(title, GetActiveTabTitle());
     return false;
   }
 };
 
 TEST_F(ErrorPageTest, DNSError_Basic) {
   GURL test_url(URLRequestFailedDnsJob::kTestUrl);
 
   // The first navigation should fail, and the second one should be the error
@@ skipping 172 matching lines @@
   // page.
   NavigateToURLBlockUntilNavigationsComplete(
       URLRequestMockHTTPJob::GetMockUrl(
           FilePath(FILE_PATH_LITERAL("page404.html"))), 2);
   EXPECT_TRUE(WaitForTitleMatching(L"Mock Link Doctor"));
 
   EXPECT_TRUE(GetActiveTab()->GoBack());
 
   EXPECT_TRUE(WaitForTitleMatching(L"Title Of Awesomeness"));
 }