Move ContentBrowserTest class to content/public, since it's used by components_browsertests for bro…

content/browser/child_process_security_policy_browsertest.cc

Index: content/browser/child_process_security_policy_browsertest.cc
===================================================================
--- content/browser/child_process_security_policy_browsertest.cc	(revision 259922)
+++ content/browser/child_process_security_policy_browsertest.cc	(working copy)
@@ -10,9 +10,9 @@
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/common/result_codes.h"
+#include "content/public/test/content_browser_test.h"
+#include "content/public/test/content_browser_test_utils.h"
 #include "content/shell/browser/shell.h"
-#include "content/test/content_browser_test.h"
-#include "content/test/content_browser_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {