Convert //cc from scoped_ptr to std::unique_ptr.

cc/output/delegating_renderer_unittest.cc

Index: cc/output/delegating_renderer_unittest.cc
diff --git a/cc/output/delegating_renderer_unittest.cc b/cc/output/delegating_renderer_unittest.cc
index 63b4e0c6df05cb37918a4416d6570263e7efbf67..ab88909ca5a60cfa7cf469a4595347809885903a 100644
--- a/cc/output/delegating_renderer_unittest.cc
+++ b/cc/output/delegating_renderer_unittest.cc
@@ -18,8 +18,8 @@ class DelegatingRendererTest : public LayerTreeTest {
   DelegatingRendererTest() : LayerTreeTest(), output_surface_(NULL) {}
   ~DelegatingRendererTest() override {}
 
-  scoped_ptr<OutputSurface> CreateOutputSurface() override {
-    scoped_ptr<FakeOutputSurface> output_surface =
+  std::unique_ptr<OutputSurface> CreateOutputSurface() override {
+    std::unique_ptr<FakeOutputSurface> output_surface =
         FakeOutputSurface::CreateDelegating3d();
     output_surface_ = output_surface.get();
     return std::move(output_surface);