Refactor GL surface format handling

ui/gl/gl_surface_wgl.h

Index: ui/gl/gl_surface_wgl.h
diff --git a/ui/gl/gl_surface_wgl.h b/ui/gl/gl_surface_wgl.h
index c68f1a7371bf1bd42696335ed3915ce4dcf8c236..25990dff49871bafdcb98afddfba75406647cf13 100644
--- a/ui/gl/gl_surface_wgl.h
+++ b/ui/gl/gl_surface_wgl.h
@@ -37,7 +37,7 @@ class GL_EXPORT NativeViewGLSurfaceWGL : public GLSurfaceWGL {
   explicit NativeViewGLSurfaceWGL(gfx::AcceleratedWidget window);
 
   // Implement GLSurface.
-  bool Initialize(GLSurface::Format format) override;
+  bool Initialize(GLSurfaceFormat format) override;
   void Destroy() override;
   bool Resize(const gfx::Size& size,
               float scale_factor,
@@ -51,7 +51,7 @@ class GL_EXPORT NativeViewGLSurfaceWGL : public GLSurfaceWGL {
  private:
   ~NativeViewGLSurfaceWGL() override;
 
-  GLSurface::Format format_ = GLSurface::SURFACE_DEFAULT;
+  GLSurfaceFormat format_;
 
   gfx::AcceleratedWidget window_;
   gfx::AcceleratedWidget child_window_;
@@ -67,7 +67,7 @@ class GL_EXPORT PbufferGLSurfaceWGL : public GLSurfaceWGL {
   explicit PbufferGLSurfaceWGL(const gfx::Size& size);
 
   // Implement GLSurface.
-  bool Initialize(GLSurface::Format format) override;
+  bool Initialize(GLSurfaceFormat format) override;
   void Destroy() override;
   bool IsOffscreen() override;
   gfx::SwapResult SwapBuffers() override;