Move ZoomObserver, ZoomController and ZoomEventManager to components/.

components/ui/zoom/zoom_observer.h

Index: components/ui/zoom/zoom_observer.h
diff --git a/chrome/browser/ui/zoom/zoom_observer.h b/components/ui/zoom/zoom_observer.h
similarity index 66%
rename from chrome/browser/ui/zoom/zoom_observer.h
rename to components/ui/zoom/zoom_observer.h
index b43dbcbbc41175d74666e6ae6c9e83fc3c2a6bab..5d99975e77f6d4112d31cccdc2fed259a11f356c 100644
--- a/chrome/browser/ui/zoom/zoom_observer.h
+++ b/components/ui/zoom/zoom_observer.h
@@ -2,14 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_UI_ZOOM_ZOOM_OBSERVER_H_
-#define CHROME_BROWSER_UI_ZOOM_ZOOM_OBSERVER_H_
+#ifndef COMPONENTS_UI_ZOOM_ZOOM_OBSERVER_H_
+#define COMPONENTS_UI_ZOOM_ZOOM_OBSERVER_H_
 
-#include "chrome/browser/ui/zoom/zoom_controller.h"
+#include "components/ui/zoom/zoom_controller.h"
 
-namespace content {
-class WebContents;
-}
+namespace ui_zoom {
 
 // Interface for objects that wish to be notified of changes in ZoomController.
 class ZoomObserver {
@@ -22,4 +20,6 @@ class ZoomObserver {
   virtual ~ZoomObserver() {}
 };
 
-#endif  // CHROME_BROWSER_UI_ZOOM_ZOOM_OBSERVER_H_
+}  // namespace ui_zoom
+
+#endif  // COMPONENTS_UI_ZOOM_ZOOM_OBSERVER_H_