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

blimp/net/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.
 
 component("net") {
   output_name = "blimp_net"
   sources = [
     "blimp_connection.cc",
     "blimp_connection.h",
     "blimp_engine_transport.h",
@@ skipping 70 matching lines @@
     "thread_pipe_manager.cc",
     "thread_pipe_manager.h",
   ]
 
   defines = [ "BLIMP_NET_IMPLEMENTATION=1" ]
 
   deps = [
     ":net_export",
     "//base",
     "//blimp/common",
-    "//blimp/helium",
     "//content/public/browser",
     "//net",
     "//third_party/WebKit/public:blink_headers",
     "//third_party/grpc:grpc++_unsecure",
     "//third_party/zlib",
     "//ui/base/ime:text_input_types",
   ]
 
   public_deps = [
     "//blimp/common/proto",
@@ skipping 67 matching lines @@
     "//blimp/common",
     "//blimp/common:test_support",
     "//blimp/common/proto",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/WebKit/public:blink_headers",
     "//third_party/grpc:grpc++_unsecure",
   ]
 }