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

BUG=247723
TEST=none
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Review URL: https://chromiumcodereview.appspot.com/16742003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205335 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 5710591..d545ba3 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -13,7 +13,7 @@
 #include "base/lazy_instance.h"
 #include "base/path_service.h"
 #include "base/prefs/pref_service.h"
-#include "base/string_number_conversions.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/app/breakpad_mac.h"