Move ZoomObserver, ZoomController and ZoomEventManager to components/.

chrome/browser/chrome_page_zoom.cc

Index: chrome/browser/chrome_page_zoom.cc
diff --git a/chrome/browser/chrome_page_zoom.cc b/chrome/browser/chrome_page_zoom.cc
index f7aa39208e13d9857e882103c8abc04d0cbd5cdf..f5baaec875b4e8ef14a054103e5d6356703ffb17 100644
--- a/chrome/browser/chrome_page_zoom.cc
+++ b/chrome/browser/chrome_page_zoom.cc
@@ -10,13 +10,13 @@
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/chrome_page_zoom_constants.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/ui/zoom/zoom_controller.h"
 #include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/page_zoom.h"
 #include "content/public/common/renderer_preferences.h"
+#include "extensions/browser/ui/zoom/zoom_controller.h"
 
 using base::UserMetricsAction;
 
@@ -66,8 +66,8 @@ std::vector<double> PresetZoomLevels(double custom_level) {
 }
 
 void Zoom(content::WebContents* web_contents, content::PageZoom zoom) {
-  ZoomController* zoom_controller =
-      ZoomController::FromWebContents(web_contents);
+  extensions::ZoomController* zoom_controller =
+      extensions::ZoomController::FromWebContents(web_contents);
   DCHECK(zoom_controller);
 
   double current_zoom_level = zoom_controller->GetZoomLevel();