Make surface GetFormat pure virtual, add missing overrides.

ui/gl/gl_surface.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gl/gl_surface.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 115 matching lines @@
 
 void* GLSurface::GetConfig() {
   NOTIMPLEMENTED();
   return NULL;
 }
 
 unsigned long GLSurface::GetCompatibilityKey() {
   return 0;
 }
 
-GLSurfaceFormat GLSurface::GetFormat() {
-  NOTIMPLEMENTED();
-  return GLSurfaceFormat();
-}
-
 gfx::VSyncProvider* GLSurface::GetVSyncProvider() {
   return NULL;
 }
 
 bool GLSurface::ScheduleOverlayPlane(int z_order,
                                      gfx::OverlayTransform transform,
                                      GLImage* image,
                                      const gfx::Rect& bounds_rect,
                                      const gfx::RectF& crop_rect) {
   NOTIMPLEMENTED();
@@ skipping 219 matching lines @@
 scoped_refptr<GLSurface> InitializeGLSurface(scoped_refptr<GLSurface> surface) {
   return InitializeGLSurfaceWithFormat(surface, GLSurfaceFormat());
 }
 
 GLSurface::CALayerInUseQuery::CALayerInUseQuery() = default;
 GLSurface::CALayerInUseQuery::CALayerInUseQuery(const CALayerInUseQuery&) =
     default;
 GLSurface::CALayerInUseQuery::~CALayerInUseQuery() = default;
 
 }  // namespace gl