prune down content_dll change to just the CONTENT_EXPORTS

content/browser/host_zoom_map.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.
 
 // Maps hostnames to custom zoom levels.  Written on the UI thread and read on
 // any thread.  One instance per browser context.
 
 #ifndef CONTENT_BROWSER_HOST_ZOOM_MAP_H_
 #define CONTENT_BROWSER_HOST_ZOOM_MAP_H_
 #pragma once
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 #include "content/browser/browser_thread.h"
+#include "content/common/content_export.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
 
 class GURL;
 
 // HostZoomMap needs to be deleted on the UI thread because it listens
 // to notifications on there (and holds a NotificationRegistrar).
-class HostZoomMap :
-    public NotificationObserver,
-    public base::RefCountedThreadSafe<HostZoomMap,
-                                      BrowserThread::DeleteOnUIThread> {
+class CONTENT_EXPORT HostZoomMap
+    : public NotificationObserver,
+      public base::RefCountedThreadSafe<HostZoomMap,
+                                        BrowserThread::DeleteOnUIThread> {
  public:
   HostZoomMap();
 
   // Returns the zoom level for the host or spec for a given url. The zoom
   // level is determined by the host portion of the URL, or (in the absence of
   // a host) the complete spec of the URL. In most cases, there is no custom
   // zoom level, and this returns the user's default zoom level.  Otherwise,
   // returns the saved zoom level, which may be positive (to zoom in) or
   // negative (to zoom out).
   //
@@ skipping 25 matching lines @@
 
   // NotificationObserver implementation.
   virtual void Observe(int type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   double default_zoom_level() const { return default_zoom_level_; }
   void set_default_zoom_level(double level) { default_zoom_level_ = level; }
 
  private:
+  friend base::RefCountedThreadSafe<HostZoomMap,
+                                    BrowserThread::DeleteOnUIThread>;
   friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
   friend class DeleteTask<HostZoomMap>;
 
   typedef std::map<std::string, double> HostZoomLevels;
 
   virtual ~HostZoomMap();
 
   // Copy of the pref data, so that we can read it on the IO thread.
   HostZoomLevels host_zoom_levels_;
   double default_zoom_level_;
@@ skipping 11 matching lines @@
   // Used around accesses to |host_zoom_levels_|, |default_zoom_level_| and
   // |temporary_zoom_levels_| to guarantee thread safety.
   mutable base::Lock lock_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(HostZoomMap);
 };
 
 #endif  // CONTENT_BROWSER_HOST_ZOOM_MAP_H_