Use a direct include of strings headers in chrome/browser/chromeos/.

BUG=247723
TEST=none
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Review URL: https://chromiumcodereview.appspot.com/15798019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205469 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/chromeos/drive/file_cache.cc b/chrome/browser/chromeos/drive/file_cache.cc
index c04d0da..8df9a37 100644
--- a/chrome/browser/chromeos/drive/file_cache.cc
+++ b/chrome/browser/chromeos/drive/file_cache.cc
@@ -9,8 +9,8 @@
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/logging.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/sys_info.h"
 #include "base/task_runner_util.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"