content: convert zoom notifications to observer usage

content/browser/host_zoom_map_impl.cc

 // 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.
 
 #include <cmath>
 
 #include "content/browser/host_zoom_map_impl.h"
 
 #include "base/string_piece.h"
 #include "base/utf_string_conversions.h"
@@ skipping 72 matching lines @@
   for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
        !i.IsAtEnd(); i.Advance()) {
     RenderProcessHost* render_process_host = i.GetCurrentValue();
     if (HostZoomMap::GetForBrowserContext(
             render_process_host->GetBrowserContext()) == this) {
       render_process_host->Send(
           new ViewMsg_SetZoomLevelForCurrentURL(host, level));
     }
   }
 
-  NotificationService::current()->Notify(
-      NOTIFICATION_ZOOM_LEVEL_CHANGED,
-      Source<HostZoomMap>(this),
-      Details<const std::string>(&host));
+  FOR_EACH_OBSERVER(HostZoomMap::Observer, observers_,
+                    OnZoomLevelChanged(host));
 }
 
 double HostZoomMapImpl::GetDefaultZoomLevel() const {
   return default_zoom_level_;
 }
 
 void HostZoomMapImpl::SetDefaultZoomLevel(double level) {
   default_zoom_level_ = level;
 }
 
@@ skipping 31 matching lines @@
 
     if (level && i == temporary_zoom_levels_.size()) {
       TemporaryZoomLevel temp;
       temp.render_process_id = render_process_id;
       temp.render_view_id = render_view_id;
       temp.zoom_level = level;
       temporary_zoom_levels_.push_back(temp);
     }
   }
 
-  std::string host;
-  NotificationService::current()->Notify(
-      NOTIFICATION_ZOOM_LEVEL_CHANGED,
-      Source<HostZoomMap>(this),
-      Details<const std::string>(&host));
+  FOR_EACH_OBSERVER(HostZoomMap::Observer, observers_,
+                    OnZoomLevelChanged(""));
 }
 
 void HostZoomMapImpl::Observe(int type,
                               const NotificationSource& source,
                               const NotificationDetails& details) {
   switch (type) {
     case NOTIFICATION_RENDER_VIEW_HOST_WILL_CLOSE_RENDER_VIEW: {
       base::AutoLock auto_lock(lock_);
       int render_view_id = Source<RenderViewHost>(source)->GetRoutingID();
       int render_process_id =
           Source<RenderViewHost>(source)->GetProcess()->GetID();
 
       for (size_t i = 0; i < temporary_zoom_levels_.size(); ++i) {
         if (temporary_zoom_levels_[i].render_process_id == render_process_id &&
             temporary_zoom_levels_[i].render_view_id == render_view_id) {
           temporary_zoom_levels_.erase(temporary_zoom_levels_.begin() + i);
           break;
         }
       }
       break;
     }
     default:
       NOTREACHED() << "Unexpected preference observed.";
   }
 }
 
+void HostZoomMapImpl::AddObserver(HostZoomMap::Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void HostZoomMapImpl::RemoveObserver(HostZoomMap::Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
 HostZoomMapImpl::~HostZoomMapImpl() {
 }
 
 }  // namespace content