cc: Make ScopedResource constructor public, use MakeUnique to construct

cc/output/gl_renderer.cc

Index: cc/output/gl_renderer.cc
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index cb76e74e1456af40bdadeb35a597800259ba5acf..5471f1197fa25e12a215ea50d89c2ff4ce9bc54a 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -877,8 +877,8 @@ gfx::Rect GLRenderer::GetBackdropBoundingBoxForRenderPassQuad(
 
 std::unique_ptr<ScopedResource> GLRenderer::GetBackdropTexture(
     const gfx::Rect& bounding_rect) {
-  std::unique_ptr<ScopedResource> device_background_texture =
-      ScopedResource::Create(resource_provider_);
+  auto device_background_texture =
+      base::MakeUnique<ScopedResource>(resource_provider_);
   // CopyTexImage2D fails when called on a texture having immutable storage.
   device_background_texture->Allocate(
       bounding_rect.size(), ResourceProvider::TEXTURE_HINT_DEFAULT,