Revert of Separate RenderView from RenderWidget, part 1: inheritance.

content/renderer/render_widget_browsertest.cc

Index: content/renderer/render_widget_browsertest.cc
diff --git a/content/renderer/render_widget_browsertest.cc b/content/renderer/render_widget_browsertest.cc
index 489536df3df5efcd0eba2982548fe2c9e695b2ea..8cbdf085adb1c9d4ab3857697ec57b5c93b4c48c 100644
--- a/content/renderer/render_widget_browsertest.cc
+++ b/content/renderer/render_widget_browsertest.cc
@@ -11,7 +11,9 @@
 
 class RenderWidgetTest : public RenderViewTest {
  protected:
-  RenderWidget* widget() { return view_->GetWidget(); }
+  RenderWidget* widget() {
+    return static_cast<RenderViewImpl*>(view_);
+  }
 
   void OnResize(const ResizeParams& params) {
     widget()->OnResize(params);