Move ImageDecoder to components/image_fetcher/content

components/image_fetcher/content/BUILD.gn

+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+static_library("content") {
+  sources = [
+    "image_decoder.cc",
+    "image_decoder.h",
+    "image_decoder_impl.cc",
+    "image_decoder_impl.h",
+  ]
+
+  public_deps = [
+    "//base",
+    "//ui/gfx",
+  ]
+
+  deps = [
+    "//base",
+    "//components/image_fetcher/core",
+    "//content/public/browser",
+    "//content/public/common",
+    "//ipc",
+    "//services/data_decoder/public/cpp",
+    "//services/service_manager/public/cpp",
+    "//skia",
+  ]
+}