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

cc/test/test_shared_bitmap_manager.h

Index: cc/test/test_shared_bitmap_manager.h
diff --git a/cc/test/test_shared_bitmap_manager.h b/cc/test/test_shared_bitmap_manager.h
index acba0969eae1be7306a534fbb767ad684d1aac04..912d03dbf9b06e103eb1adcbe182fe43d13d69ae 100644
--- a/cc/test/test_shared_bitmap_manager.h
+++ b/cc/test/test_shared_bitmap_manager.h
@@ -21,9 +21,10 @@ class TestSharedBitmapManager : public SharedBitmapManager {
   TestSharedBitmapManager();
   ~TestSharedBitmapManager() override;
 
-  scoped_ptr<SharedBitmap> AllocateSharedBitmap(const gfx::Size& size) override;
+  std::unique_ptr<SharedBitmap> AllocateSharedBitmap(
+      const gfx::Size& size) override;
 
-  scoped_ptr<SharedBitmap> GetSharedBitmapFromId(
+  std::unique_ptr<SharedBitmap> GetSharedBitmapFromId(
       const gfx::Size&,
       const SharedBitmapId& id) override;