Extract minimal RenderViewHost interface for embedders, leaving

chrome/browser/ui/gtk/extensions/extension_view_gtk.cc

Index: chrome/browser/ui/gtk/extensions/extension_view_gtk.cc
diff --git a/chrome/browser/ui/gtk/extensions/extension_view_gtk.cc b/chrome/browser/ui/gtk/extensions/extension_view_gtk.cc
index 463eae07afde6997190769ab3200cd1a65b046ea..c2d8717acb7951c53fd8bacb752303c1c699d0fc 100644
--- a/chrome/browser/ui/gtk/extensions/extension_view_gtk.cc
+++ b/chrome/browser/ui/gtk/extensions/extension_view_gtk.cc
@@ -31,8 +31,8 @@ RenderViewHost* ExtensionViewGtk::render_view_host() const {
 }
 
 void ExtensionViewGtk::SetBackground(const SkBitmap& background) {
-  if (render_view_host()->IsRenderViewLive() && render_view_host()->view()) {
-    render_view_host()->view()->SetBackground(background);
+  if (render_view_host()->IsRenderViewLive() && render_view_host()->GetView()) {
+    render_view_host()->GetView()->SetBackground(background);
   } else {
     pending_background_ = background;
   }
@@ -48,8 +48,8 @@ void ExtensionViewGtk::CreateWidgetHostView() {
 }
 
 void ExtensionViewGtk::RenderViewCreated() {
-  if (!pending_background_.empty() && render_view_host()->view()) {
-    render_view_host()->view()->SetBackground(pending_background_);
+  if (!pending_background_.empty() && render_view_host()->GetView()) {
+    render_view_host()->GetView()->SetBackground(pending_background_);
     pending_background_.reset();
   }