Export RenderWidgetHostViewAura and sensors::Provider to fix component build.

content/browser/sensors/sensors_provider.h

 // Copyright (c) 2011 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.
 
 #ifndef CONTENT_BROWSER_SENSORS_PROVIDER_H_
 #define CONTENT_BROWSER_SENSORS_PROVIDER_H_
 #pragma once
 
 #include "base/basictypes.h"
+#include "content/common/content_export.h"
 #include "content/common/sensors_listener.h"
 
 // The sensors API will unify various types of sensor data into a set of
 // channels, each of which provides change events and periodic updates.
 //
 // This version of the API is intended only to support the experimental screen
 // rotation code and is not for general use. In particular, the final listener
 // will declare generic |OnSensorChanged| and |OnSensorUpdated| methods, rather
 // than the special-purpose |OnScreenOrientationChanged|.
 
 namespace sensors {
 
 // TODO(cwolfe): Finish defining the initial set of channels and replace this
 // with the generic sensor provider.
 //
-class Provider {
+class CONTENT_EXPORT Provider {
  public:
   static Provider* GetInstance();
 
   // Adds a sensor listener. The listener will receive callbacks to indicate
   // sensor changes and updates until it is removed.
   //
   // This method may be called in any thread. Callbacks on a listener will
   // always be executed in the thread which added that listener.
   virtual void AddListener(Listener* listener) = 0;
 
@@ skipping 12 matching lines @@
  protected:
   Provider();
   virtual ~Provider();
 
   DISALLOW_COPY_AND_ASSIGN(Provider);
 };
 
 }  // namespace sensors
 
 #endif  // CONTENT_BROWSER_SENSORS_PROVIDER_H_