Removed webui_generator and new OOBE UI placeholder.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 418 matching lines @@
   }
 
   if (is_linux && !is_chromeos) {
     deps += [
       # TODO(GYP): Figure out which of these should (and can) build
       # under which other conditions.
       "//build/sanitizers:copy_llvm_symbolizer",
       "//chrome/test:chrome_app_unittests",
       "//cloud_print:cloud_print_unittests",
       "//components/network_hints/browser",
-      "//components/webui_generator",
       "//content/public/app:browser",
       "//content/public/app:child",
 
       # TODO(GYP): Remove this when the gles2 tests work
       "//gpu/command_buffer/client:gles2_implementation_no_check",
 
       "//gpu/khronos_glcts_support:khronos_glcts_test",  # TODO(GYP) crbug.com/471903 to make this complete.
       "//media/cast:cast_benchmarks",
       "//media/cast:tap_proxy",
       "//mojo/application/public/cpp",
@@ skipping 453 matching lines @@
       "//ui/views:views_unittests",  # TooltipControllerTest failures
       "//ui/wm:wm_unittests",  # PASSES 4/21/2015
       "//url:url_unittests",  # PASSES 4/17/2015
 
       # TODO(GYP) nacl_integration
       # TODO(GYP) telemetry_perf_unittests
       # TODO(GYP) telemetry_unittests
     ]
   }
 }