Delete blimp/helium and remove references to it from dependent targets

blimp/engine/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/repack.gni")
@@ skipping 291 matching lines @@
     "feature/geolocation/engine_geolocation_feature.cc",
     "feature/geolocation/engine_geolocation_feature.h",
   ]
 
   deps = [
     "//base",
     "//blimp/common",
     "//blimp/common/proto",
     "//blimp/engine:app_settings",
     "//blimp/engine:common",
-    "//blimp/helium",
     "//blimp/net",
     "//content/public/browser",
     "//content/public/common",
     "//device/geolocation",
     "//net",
     "//ui/base",
     "//ui/base/ime",
     "//ui/resources",
     "//ui/wm",
   ]
@@ skipping 495 matching lines @@
     "//ui/events",
     "//ui/gfx/geometry",
     "//url",
   ]
 
   data = [
     "//blimp/test/data/",
     "$root_out_dir/blimp_engine.pak",
   ]
 }