Move all the layout tests that ran under browser_tests to run under content_browsertests.

content/shell/shell_content_browser_client.cc

Index: content/shell/shell_content_browser_client.cc
===================================================================
--- content/shell/shell_content_browser_client.cc	(revision 148205)
+++ content/shell/shell_content_browser_client.cc	(working copy)
@@ -88,6 +88,11 @@
   return shell_browser_main_parts_->browser_context();
 }
 
+ShellBrowserContext*
+    ShellContentBrowserClient::off_the_record_browser_context() {
+  return shell_browser_main_parts_->off_the_record_browser_context();
+}
+
 AccessTokenStore* ShellContentBrowserClient::CreateAccessTokenStore() {
   return new ShellAccessTokenStore(browser_context()->GetRequestContext());
 }