Drop unneeded build deps on /net.

ui/base/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.
 
 import("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
@@ skipping 21 matching lines @@
     "//ui/events",
     "//ui/events/platform",
     "//ui/events:events_base",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
   deps = [
     "//base/third_party/dynamic_annotations",
     "//base:base_static",
     "//base:i18n",
-    "//net",
     "//third_party/icu",
     "//url",
   ]
 
   if (is_linux) {
     configs += [ "//build/config/linux:fontconfig" ]
   }
 
   libs = []
   if (is_win) {
@@ skipping 144 matching lines @@
           "//chromeos",
           "//ui/aura:test_support",
           "//ui/events:gesture_detection",
           "//ui/chromeos:ui_chromeos",
         ]
       }
     }
   }
 }
 # TODO(GYP) Mac (ui_unittest_bundle) and Android (ui_unittests_apk).