Remove unused code

We don't use yasm, libjpeg_turbo, or mojo's devtools.

DEPS

@@ -69,19 +69,9 @@ deps = {
    Var('chromium_git') + '/external/github.com/domokit/mojo_sdk' + '@' +
    Var('mojo_sdk_revision'),
 
-  'src/mojo/devtools':
-   'https://github.com/domokit/devtools.git' + '@' +
-   Var('mojo_devtools_revision'),
-
   'src/third_party/skia':
    Var('chromium_git') + '/skia.git' + '@' +  Var('skia_revision'),
 
-  'src/third_party/yasm/source/patched-yasm':
-   Var('chromium_git') + '/chromium/deps/yasm/patched-yasm.git' + '@' + '4671120cd8558ce62ee8672ebf3eb6f5216f909b',
-
-  'src/third_party/libjpeg_turbo':
-   Var('chromium_git') + '/chromium/deps/libjpeg_turbo.git' + '@' + 'f4631b6ee8b1dbb05e51ae335a7886f9ac598ab6',
-
   'src/third_party/mesa/src':
    Var('chromium_git') + '/chromium/deps/mesa.git' + '@' + '071d25db04c23821a12a8b260ab9d96a097402f0',
 }

engine/src/flutter/sky/tools/gn

@@ -53,9 +53,7 @@ def to_gn_args(args):
         gn_args['target_os'] = 'ios'
         gn_args['ios_deployment_target'] = '7.0'
         gn_args['use_ios_simulator'] = args.simulator
-        if args.simulator:
-            gn_args['use_libjpeg_turbo'] = False
-        else:
+        if not args.simulator:
           # The iOS simulator snapshot is host targetted
           gn_args['dart_target_arch'] = ios_target_cpu
     elif args.target_os == 'fnl':

engine/src/flutter/third_party/BUILD.gn

@@ -2,42 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-if (is_android) {
-  import("//build/config/android/config.gni")
-}
-
-declare_args() {
-  # Uses system libjpeg. If true, overrides use_libjpeg_turbo.
-  use_system_libjpeg = false
-
-  # Uses libjpeg_turbo as the jpeg implementation. Has no effect if
-  # use_system_libjpeg is set.
-  use_libjpeg_turbo = true
-}
-
-config("system_libjpeg_config") {
-  defines = [ "USE_SYSTEM_LIBJPEG" ]
-}
-
-config("libjpeg_turbo_config") {
-  defines = [ "USE_LIBJPEG_TURBO" ]
-}
-
-# This is a meta target that forwards to the system's libjpeg,
-# third_party/libjpeg, or third_party/libjpeg_turbo depending on the build args
-# declared in this file.
 group("jpeg") {
-  if (use_system_libjpeg) {
-    libs = [ "jpeg" ]
-    public_configs = [ ":system_libjpeg_config" ]
-  } else if (use_libjpeg_turbo) {
-    deps = [
-      "//third_party/libjpeg_turbo:libjpeg",
-    ]
-    public_configs = [ ":libjpeg_turbo_config" ]
-  } else {
-    deps = [
-      "//third_party/libjpeg:libjpeg",
-    ]
-  }
+  deps = [
+    "//third_party/libjpeg:libjpeg",
+  ]
 }