Move MainWorldScriptContext accessor/method from WebFrame to WebLocalFrame.

content/shell/test_runner/gc_controller.h

Index: content/shell/test_runner/gc_controller.h
diff --git a/content/shell/test_runner/gc_controller.h b/content/shell/test_runner/gc_controller.h
index 49e4b0611bfc7dafe5181353932c79964d0d588d..9c34adcfe7b0a7c37af7260533383b32ea29d0f3 100644
--- a/content/shell/test_runner/gc_controller.h
+++ b/content/shell/test_runner/gc_controller.h
@@ -9,7 +9,7 @@
 #include "gin/wrappable.h"
 
 namespace blink {
-class WebFrame;
+class WebLocalFrame;
 }
 
 namespace gin {
@@ -21,7 +21,7 @@ namespace test_runner {
 class GCController : public gin::Wrappable<GCController> {
  public:
   static gin::WrapperInfo kWrapperInfo;
-  static void Install(blink::WebFrame* frame);
+  static void Install(blink::WebLocalFrame* frame);
 
  private:
   GCController();