Decompose //extensions/browser/BUILD.gn

extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc

Index: extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc
diff --git a/extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc b/extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc
index 1aa75322862e99a797123862fdaddc7017136006..49d61e37e143da5ff23a7758c6252e4838e8c2e7 100644
--- a/extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc
+++ b/extensions/browser/api/bluetooth_socket/bluetooth_socket_api.cc
@@ -606,8 +606,7 @@ void BluetoothSocketSendFunction::AsyncWorkStart() {
     return;
   }
 
-  socket->Send(io_buffer_,
-               io_buffer_size_,
+  socket->Send(io_buffer_, static_cast<int>(io_buffer_size_),

[Devlin, 2016/09/13 17:10:49]

?  This seems orthogonal to this CL.

[Rahul Chaturvedi, 2016/09/13 20:33:49]

So these are actually real build errors - which for some reason were not showing
up earlier. Doing this build change seems to have, fixed?, the compiler on Win64
and these start breaking.

There are several of these changes over the code, fixing implicit conversions to
int from size_t.

                base::Bind(&BluetoothSocketSendFunction::OnSuccess, this),
                base::Bind(&BluetoothSocketSendFunction::OnError, this));
 }