Remove RWHV::SetBounds() from the public API, and make comments clearer.

content/browser/renderer_host/render_widget_host_view_base.h

Index: content/browser/renderer_host/render_widget_host_view_base.h
diff --git a/content/browser/renderer_host/render_widget_host_view_base.h b/content/browser/renderer_host/render_widget_host_view_base.h
index b7e0cda7766034cfe42ee7698329d66fe6aefed0..944b8cc1c3b514c8fc04fad15cadfdb4729851d5 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.h
+++ b/content/browser/renderer_host/render_widget_host_view_base.h
@@ -159,6 +159,12 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
   // The size of the view's backing surface in non-DPI-adjusted pixels.
   virtual gfx::Size GetPhysicalBackingSize() const;
 
+  // Requests that the View's top-level window move itself to the specified
+  // position and size on-screen (in screen coordinates). This is used for
+  // pop-ups and some types of fullscreen Views. The default implementation is a
+  // no-op.
+  virtual void RequestTopLevelBoundsInScreen(const gfx::Rect& rect);
+
   // Whether or not Blink's viewport size should be shrunk by the height of the
   // URL-bar.
   virtual bool DoBrowserControlsShrinkBlinkSize() const;