Move non-browser specific ScreenshotTaker code to ui/snapshot.

components/screenshot_taker/BUILD.gn

 # Copyright 2014 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.
 
-source_set("crx_file") {
+component("screenshot_taker") {
   sources = [
-    "constants.h",
-    "crx_file.cc",
-    "crx_file.h",
-    "id_util.cc",
-    "id_util.h",
+    "screenshot_taker.cc",
+    "screenshot_taker.h",
   ]
 
   deps = [
-    "//base",
+    "//ui/snapshot",
+    "//skia",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
-    "id_util_unittest.cc",
+    "screenshot_taker_unittest.cc",
   ]
 
   deps = [
-    ":crx_file",
+    ":screenshot_taker",
     "//testing/gtest",
+    "//ui/aura:test_support",
   ]
 }