Use a direct include of strings headers in base/.

BUG=247723
TEST=none
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Review URL: https://chromiumcodereview.appspot.com/16667013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205261 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/pickle.h b/base/pickle.h
index 62dcd15..3de2886 100644
--- a/base/pickle.h
+++ b/base/pickle.h
@@ -12,7 +12,7 @@
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/logging.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 
 class Pickle;