Revert of mac: Weakly link against the CoreBluetooth framework.

device/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/features.gni")
 import("//testing/test.gni")
 
 is_linux_without_udev = is_linux && !use_udev
 is_linux_without_dbus = is_linux && !use_dbus
 
@@ skipping 94 matching lines @@
       "//dbus",
     ]
   }
 
   if (is_posix && !is_android && !is_mac) {
     libs = [ "rt" ]
   }
 
   if (is_mac) {
     libs = [ "IOBluetooth.framework" ]
-
-    # In the OSX 10.10 SDK, CoreBluetooth became a top level framework.
-    # Previously, it was nested in IOBluetooth. In order for Chrome to run on
-    # OSes older than OSX 10.10, the top level CoreBluetooth framework must be
-    # weakly linked.
-    if (mac_sdk_version == "10.10") {
-      ldflags = [ "-weak_framework CoreBluetooth" ]
-    }
   }
 }