Move ZoomObserver, ZoomController and ZoomEventManager to components/.

chrome/browser/ui/browser_commands.cc

Index: chrome/browser/ui/browser_commands.cc
diff --git a/chrome/browser/ui/browser_commands.cc b/chrome/browser/ui/browser_commands.cc
index b289ec114e1dd77b78f6e1ff53f46c4e65fa069c..64261f153d31c8c5ba91ef8619ab527f0eef205f 100644
--- a/chrome/browser/ui/browser_commands.cc
+++ b/chrome/browser/ui/browser_commands.cc
@@ -50,7 +50,6 @@
 #include "chrome/browser/ui/status_bubble.h"
 #include "chrome/browser/ui/tab_contents/core_tab_helper.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
-#include "chrome/browser/ui/zoom/zoom_controller.h"
 #include "chrome/browser/upgrade_detector.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_version_info.h"
@@ -75,6 +74,7 @@
 #include "content/public/common/url_constants.h"
 #include "content/public/common/url_utils.h"
 #include "content/public/common/user_agent.h"
+#include "extensions/browser/ui/zoom/zoom_controller.h"
 #include "net/base/escape.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 
@@ -596,19 +596,22 @@ void CloseTab(Browser* browser) {
 }
 
 bool CanZoomIn(content::WebContents* contents) {
-  ZoomController* zoom_controller = ZoomController::FromWebContents(contents);
+  extensions::ZoomController* zoom_controller =
+      extensions::ZoomController::FromWebContents(contents);
   return zoom_controller->GetZoomPercent() !=
       contents->GetMaximumZoomPercent() + 1;
 }
 
 bool CanZoomOut(content::WebContents* contents) {
-  ZoomController* zoom_controller = ZoomController::FromWebContents(contents);
+  extensions::ZoomController* zoom_controller =
+      extensions::ZoomController::FromWebContents(contents);
   return zoom_controller->GetZoomPercent() !=
       contents->GetMinimumZoomPercent();
 }
 
 bool ActualSize(content::WebContents* contents) {
-  ZoomController* zoom_controller = ZoomController::FromWebContents(contents);
+  extensions::ZoomController* zoom_controller =
+      extensions::ZoomController::FromWebContents(contents);
   return zoom_controller->GetZoomPercent() != 100.0f;
 }