Use a direct include of strings headers in testing/, third_party/, tools/.

third_party/libjingle/overrides/talk/base/logging.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 "third_party/libjingle/overrides/talk/base/logging.h"
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 #include <CoreServices/CoreServices.h>
 #endif  // OS_MACOSX
 
 #include <iomanip>
 
 #include "base/atomicops.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/threading/platform_thread.h"
 #include "third_party/libjingle/source/talk/base/stream.h"
 #include "third_party/libjingle/source/talk/base/stringencode.h"
 #include "third_party/libjingle/source/talk/base/stringutils.h"
 
 // From this file we can't use VLOG since it expands into usage of the __FILE__
 // macro (for correct filtering). The actual logging call from LOG_E is in
 // ~LogEHelper, and from DIAGNOSTIC_LOG in ~DiagnosticLogMessage. Note that the
 // second parameter to the LAZY_STREAM macro is true since the filter check has
 // already been done for LOG_E and DIAGNOSTIC_LOG.
@@ skipping 255 matching lines @@
       static_cast<base::subtle::Atomic32>(base::PlatformThread::CurrentId()));
   DCHECK_EQ(g_init_logging_delegate_thread_id,
             base::PlatformThread::CurrentId());
 #endif
   CHECK(!g_logging_delegate_function);
   CHECK(delegate);
   g_logging_delegate_function = delegate;
 }
 
 }  // namespace talk_base