Use a direct include of utf_string_conversions.h in content/.

BUG=none
TEST=none
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Review URL: https://chromiumcodereview.appspot.com/16408017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@204917 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/tracing/tracing_ui.cc b/content/browser/tracing/tracing_ui.cc
index 08bab8b2f..0df529a 100644
--- a/content/browser/tracing/tracing_ui.cc
+++ b/content/browser/tracing/tracing_ui.cc
@@ -16,7 +16,7 @@
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/strings/string_number_conversions.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"