Run input_method_bridge_unittest on Mac, remove unused DummyInputMethodDelegate

ui/base/ime/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/ui.gni")
 import("//testing/test.gni")
 
 component("ime") {
   output_name = "ui_base_ime"
   sources = [
@@ skipping 34 matching lines @@
     "chromeos/mock_ime_candidate_window_handler.h",
     "chromeos/mock_ime_engine_handler.cc",
     "chromeos/mock_ime_engine_handler.h",
     "chromeos/mock_ime_input_context_handler.cc",
     "chromeos/mock_ime_input_context_handler.h",
     "composition_text.cc",
     "composition_text.h",
     "composition_text_util_pango.cc",
     "composition_text_util_pango.h",
     "composition_underline.h",
-    "dummy_input_method_delegate.cc",
-    "dummy_input_method_delegate.h",
     "infolist_entry.cc",
     "infolist_entry.h",
     "input_method.h",
     "input_method_auralinux.cc",
     "input_method_auralinux.h",
     "input_method_base.cc",
     "input_method_base.h",
     "input_method_chromeos.cc",
     "input_method_chromeos.h",
     "input_method_delegate.h",
@@ skipping 103 matching lines @@
     libs = [ "imm32.lib" ]
   }
 
   if (use_ozone) {
     deps += [
       "//ui/ozone",
       "//ui/events/ozone:events_ozone_layout",
     ]
   }
 }