Revert of mac: Weakly link against the CoreBluetooth framework.

device/BUILD.gn

Index: device/BUILD.gn
diff --git a/device/BUILD.gn b/device/BUILD.gn
index becef455c1dcb84cec65d1ae4ec61103470c1b65..3bf6fa77878d31482b8f299773bb4a027d5cba20 100644
--- a/device/BUILD.gn
+++ b/device/BUILD.gn
@@ -112,13 +112,5 @@
 
   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" ]
-    }
   }
 }