Move wifi_data_provider_chromeos.* from chrome\browser\geolocation to content\browser\geolocation b…

content/browser/geolocation/device_data_provider.h

 // Copyright (c) 2012 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.
 
 // A device data provider provides data from the device that is used by a
 // NetworkLocationProvider to obtain a position fix. This data may be either
 // cell radio data or wifi data. For a given type of data, we use a singleton
 // instance of the device data provider, which is used by multiple
 // NetworkLocationProvider objects.
 //
@@ skipping 108 matching lines @@
     return listeners_.erase(listener) == 1;
   }
 
   bool has_listeners() const {
     DCHECK(CalledOnClientThread());
     return !listeners_.empty();
   }
 
  protected:
   virtual ~DeviceDataProviderImplBase() {
-    DCHECK(CalledOnClientThread());

[jam, 2013/01/04 19:01:18]

this is needed because in some tests, there are outstanding tasks that keep a
reference to the parent class at shutdown. As a result the parent class gets
destructed on the UI thread instead of the geolocation thread. This only happens
with the chromeos implementation, but it didn't come up before because that
implementation wasn't actually being used on cros (the linux one was).

   }
 
   // Calls DeviceDataUpdateAvailable() on all registered listeners.
   typedef std::set<ListenerInterface*> ListenersSet;
   void NotifyListeners() {
     // Always make the notify callback via a posted task, so we can unwind
     // callstack here and make callback without causing client re-entrancy.
     client_loop_->PostTask(FROM_HERE, base::Bind(
         &DeviceDataProviderImplBase<DataType>::NotifyListenersInClientLoop,
         this));
@@ skipping 160 matching lines @@
   scoped_refptr<DeviceDataProviderImplBase<DataType> > impl_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceDataProvider);
 };
 
 typedef DeviceDataProvider<WifiData> WifiDataProvider;
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GEOLOCATION_DEVICE_DATA_PROVIDER_H_