cc: Delete the Renderer base class.

cc/output/direct_renderer.cc

Index: cc/output/direct_renderer.cc
diff --git a/cc/output/direct_renderer.cc b/cc/output/direct_renderer.cc
index 61865b1da829dca1893a655be79e9c2411a6c353..bb1fc46a3e9ef9ed665af490a51a99c08e26ea9a 100644
--- a/cc/output/direct_renderer.cc
+++ b/cc/output/direct_renderer.cc
@@ -128,18 +128,19 @@ gfx::Rect DirectRenderer::MoveFromDrawToWindowSpace(
   return window_rect;
 }
 
-DirectRenderer::DirectRenderer(RendererClient* client,
+DirectRenderer::DirectRenderer(DirectRendererClient* client,
                                const RendererSettings* settings,
                                OutputSurface* output_surface,
                                ResourceProvider* resource_provider)
-    : Renderer(client, settings),
+    : client_(client),
+      settings_(settings),
       output_surface_(output_surface),
       resource_provider_(resource_provider),
       overlay_processor_(new OverlayProcessor(output_surface)) {
   overlay_processor_->Initialize();
 }
 
-DirectRenderer::~DirectRenderer() {}
+DirectRenderer::~DirectRenderer() = default;
 
 const TileDrawQuad* DirectRenderer::CanPassBeDrawnDirectly(
     const RenderPass* pass) {
@@ -218,8 +219,6 @@ void DirectRenderer::DrawFrame(RenderPassList* render_passes_in_draw_order,
   frame.device_viewport_rect = device_viewport_rect;
   frame.device_clip_rect = device_clip_rect;
 
-  EnsureBackbuffer();
-
   // Only reshape when we know we are going to draw. Otherwise, the reshape
   // can leave the window at the wrong size if we never draw and the proper
   // viewport size is never set.