Fork VCMDecoderDatabase for VideoReceiver.

This is to keep the deprecated VideoReceiver separate from the
implementation used by VideoReceiver2 before updating
VCMDecoderDatabase to have ownership of the registered decoders.

Fixing typo (DataBase->Database) in the name of the remaining class.

Bug: webrtc:14486, webrtc:14497
Change-Id: I5ee755921454b0831b3af6d0161f5b48c7c60540
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/276781
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38247}
diff --git a/modules/video_coding/decoder_database.h b/modules/video_coding/decoder_database.h
index 4229786..8969fea 100644
--- a/modules/video_coding/decoder_database.h
+++ b/modules/video_coding/decoder_database.h
@@ -23,12 +23,12 @@
 
 namespace webrtc {
 
-class VCMDecoderDataBase {
+class VCMDecoderDatabase {
  public:
-  VCMDecoderDataBase();
-  VCMDecoderDataBase(const VCMDecoderDataBase&) = delete;
-  VCMDecoderDataBase& operator=(const VCMDecoderDataBase&) = delete;
-  ~VCMDecoderDataBase() = default;
+  VCMDecoderDatabase();
+  VCMDecoderDatabase(const VCMDecoderDatabase&) = delete;
+  VCMDecoderDatabase& operator=(const VCMDecoderDatabase&) = delete;
+  ~VCMDecoderDatabase() = default;
 
   // Returns a pointer to the previously registered decoder or nullptr if none
   // was registered for the `payload_type`.