Make base::Value::TYPE a scoped enum.

media/base/video_frame_unittest.cc

Index: media/base/video_frame_unittest.cc
diff --git a/media/base/video_frame_unittest.cc b/media/base/video_frame_unittest.cc
index 865db823aa6e2498aa80a60289e655950720852f..3fe70e9365f1a5d4ffcd95c0c48f62d46f844210 100644
--- a/media/base/video_frame_unittest.cc
+++ b/media/base/video_frame_unittest.cc
@@ -544,7 +544,7 @@ TEST(VideoFrameMetadata, SetAndThenGetAllKeysForAllTypes) {
     EXPECT_TRUE(metadata.HasKey(key));
     const base::Value* const null_value = metadata.GetValue(key);
     EXPECT_TRUE(null_value);
-    EXPECT_EQ(base::Value::TYPE_NULL, null_value->GetType());
+    EXPECT_EQ(base::Value::Type::NONE, null_value->GetType());
     metadata.Clear();
   }
 }