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

content/browser/frame_host/render_widget_host_view_guest.h

Index: content/browser/frame_host/render_widget_host_view_guest.h
diff --git a/content/browser/frame_host/render_widget_host_view_guest.h b/content/browser/frame_host/render_widget_host_view_guest.h
index fea13850ab586babd0e47695985cd93f34ecf83a..37e38994c32d1d98982b0aa0aaac753579436714 100644
--- a/content/browser/frame_host/render_widget_host_view_guest.h
+++ b/content/browser/frame_host/render_widget_host_view_guest.h
@@ -57,7 +57,6 @@ class CONTENT_EXPORT RenderWidgetHostViewGuest
   bool OnMessageReceived(const IPC::Message& msg) override;
   void InitAsChild(gfx::NativeView parent_view) override;
   void SetSize(const gfx::Size& size) override;
-  void SetBounds(const gfx::Rect& rect) override;
   void Focus() override;
   bool HasFocus() const override;
   void Show() override;
@@ -74,6 +73,7 @@ class CONTENT_EXPORT RenderWidgetHostViewGuest
   void InitAsPopup(RenderWidgetHostView* parent_host_view,
                    const gfx::Rect& bounds) override;
   void InitAsFullscreen(RenderWidgetHostView* reference_host_view) override;
+  void RequestTopLevelBoundsInScreen(const gfx::Rect& rect) override;
   void UpdateCursor(const WebCursor& cursor) override;
   void SetIsLoading(bool is_loading) override;
   void TextInputStateChanged(const TextInputState& params) override;