Use a direct include of strings headers in chrome/browser/t*-w*/.

BUG=247723
TEST=none
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Review URL: https://chromiumcodereview.appspot.com/15906012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205314 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/themes/theme_service.cc b/chrome/browser/themes/theme_service.cc
index a2646e9..efc17b47 100644
--- a/chrome/browser/themes/theme_service.cc
+++ b/chrome/browser/themes/theme_service.cc
@@ -8,7 +8,7 @@
 #include "base/memory/ref_counted_memory.h"
 #include "base/prefs/pref_service.h"
 #include "base/sequenced_task_runner.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"