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

content/shell/shell_browser_context.h

Index: content/shell/shell_browser_context.h
===================================================================
--- content/shell/shell_browser_context.h	(revision 148205)
+++ content/shell/shell_browser_context.h	(working copy)
@@ -21,7 +21,7 @@
 
 class ShellBrowserContext : public BrowserContext {
  public:
-  ShellBrowserContext();
+  explicit ShellBrowserContext(bool off_the_record);
   virtual ~ShellBrowserContext();
 
   // BrowserContext implementation.
@@ -45,6 +45,7 @@
   // allowed on the current thread.
   void InitWhileIOAllowed();
 
+  bool off_the_record_;
   ScopedTempDir testing_path_;
   FilePath path_;
   scoped_ptr<ResourceContext> resource_context_;