Use a direct include of strings headers in content/browser/, part 1.

BUG=247723
TEST=none
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Review URL: https://chromiumcodereview.appspot.com/16755004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205449 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/browser_child_process_host_impl.cc b/content/browser/browser_child_process_host_impl.cc
index 44cee2e..3748f6f2 100644
--- a/content/browser/browser_child_process_host_impl.cc
+++ b/content/browser/browser_child_process_host_impl.cc
@@ -14,7 +14,7 @@
 #include "base/path_service.h"
 #include "base/process_util.h"
 #include "base/stl_util.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/synchronization/waitable_event.h"
 #include "content/browser/histogram_message_filter.h"
 #include "content/browser/loader/resource_message_filter.h"