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

content/public/test/browser_test_utils.h

Index: content/public/test/browser_test_utils.h
===================================================================
--- content/public/test/browser_test_utils.h	(revision 148205)
+++ content/public/test/browser_test_utils.h	(working copy)
@@ -46,6 +46,9 @@
 class RenderViewHost;
 class WebContents;
 
+// Generate a URL for a file path including a query string.
+GURL GetFileUrlWithQuery(const FilePath& path, const std::string& query_string);
+
 // Simulates clicking at the center of the given tab asynchronously.
 void SimulateMouseClick(WebContents* web_contents);