Use ZoomValuesEqual() instead of ==.

components/ui/zoom/zoom_controller.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 "components/ui/zoom/zoom_controller.h"
 
 #include "components/ui/zoom/zoom_event_manager.h"
 #include "components/ui/zoom/zoom_observer.h"
 #include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/navigation_details.h"
@@ skipping 78 matching lines @@
     return false;
 
   // Store client data so the |client| can be attributed when the zoom
   // change completes. We expect that by the time this function returns that
   // any observers that require this information will have requested it.
   last_client_ = client;
 
   // Do not actually rescale the page in manual mode.
   if (zoom_mode_ == ZOOM_MODE_MANUAL) {
     // If the zoom level hasn't changed, early out to avoid sending an event.
-    if (zoom_level_ == zoom_level)
+    if (content::ZoomValuesEqual(zoom_level_, zoom_level))
       return true;
 
     double old_zoom_level = zoom_level_;
     zoom_level_ = zoom_level;
 
     // TODO(wjmaclean) Do we care about filling in host/scheme here?
     content::HostZoomMap::ZoomLevelChange change;
     change.mode = content::HostZoomMap::ZOOM_CHANGED_TEMPORARY_ZOOM;
     change.zoom_level = zoom_level;
     ZoomEventManager::GetForBrowserContext(browser_context_)
@@ skipping 236 matching lines @@
   int render_view_id = web_contents()->GetRenderViewHost()->GetRoutingID();
   host_zoom_map_->SetPageScaleFactorIsOneForView(
       render_process_id, render_view_id, is_one);
 }
 
 bool ZoomController::PageScaleFactorIsOne() const {
   return content::HostZoomMap::PageScaleFactorIsOne(web_contents());
 }
 
 }  // namespace ui_zoom