Cleanup: Remove most enable_extensions logic in chrome/ extensions code.

chrome/common/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("//tools/grit/grit_rule.gni")
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("../chrome_common.gypi") ],
     "scope",
@@ skipping 86 matching lines @@
       "//third_party/re2",
       "//third_party/widevine/cdm:version_h",
     ]
   }
 
   if (enable_extensions) {
     sources += rebase_path(
         gypi_values.chrome_common_extensions_sources,
         ".", "//chrome")
     deps += [
-      "//device/bluetooth",  # TODO(thestig) Still needed? Not in gyp version.
       "//device/usb",
       "//chrome/common/extensions/api",
       "//extensions/common",
       "//extensions/common/api",
       "//extensions:extensions_resources",
       "//extensions/strings",
     ]
   }
 
   if (is_win || is_mac) {
@@ skipping 193 matching lines @@
   }
 
   if (enable_extensions) {
     sources += [
       "extensions/extension_test_util.cc",
       "extensions/extension_test_util.h",
     ]
   }
 
 }