Remove all C++ Telemetry Accumulation calls.

This creates a number of stubs and leaves some surrounding code that may be irrelevant (eg. recorded time stamps, status variables).
Stub resolution/removal should be a follow-up to this.

image/imgFrame.cpp

@@ -22,7 +22,6 @@
 #include "mozilla/gfx/Tools.h"
 #include "mozilla/Likely.h"
 #include "mozilla/MemoryReporting.h"
-#include "mozilla/Telemetry.h"
 #include "nsMargin.h"
 #include "nsThreadUtils.h"
 
@@ -620,8 +619,6 @@ imgFrame::Finish(Opacity aFrameOpacity /* = Opacity::SOME_TRANSPARENCY */,
 
   if (aFrameOpacity == Opacity::FULLY_OPAQUE) {
     mHasNoAlpha = true;
-    Telemetry::Accumulate(Telemetry::IMAGE_DECODE_OPAQUE_BGRA,
-                          mFormat == SurfaceFormat::B8G8R8A8);
   }
 
   mDisposalMethod = aDisposalMethod;