Remove SkMovie and giflib

src/images/SkMovie_FactoryDefault.cpp

-/*
- * Copyright 2006 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkMovie.h"
-#include "SkStream.h"
-
-typedef SkTRegistry<SkMovie*(*)(SkStreamRewindable*)> MovieReg;
-
-SkMovie* SkMovie::DecodeStream(SkStreamRewindable* stream) {
-    const MovieReg* curr = MovieReg::Head();
-    while (curr) {
-        SkMovie* movie = curr->factory()(stream);
-        if (movie) {
-            return movie;
-        }
-        // we must rewind only if we got nullptr, since we gave the stream to the
-        // movie, who may have already started reading from it
-        stream->rewind();
-        curr = curr->next();
-    }
-    return nullptr;
-}