Move ZoomObserver, ZoomController and ZoomEventManager to components/.

components/ui/zoom/BUILD.gn

Index: components/ui/zoom/BUILD.gn
diff --git a/components/cdm/browser/BUILD.gn b/components/ui/zoom/BUILD.gn
similarity index 58%
copy from components/cdm/browser/BUILD.gn
copy to components/ui/zoom/BUILD.gn
index e18b67035e55756ee7f08d3048949c8f8a7feb7b..2cefb395b12b77ac84a25f610ac20fefe9833cc2 100644
--- a/components/cdm/browser/BUILD.gn
+++ b/components/ui/zoom/BUILD.gn
@@ -2,17 +2,21 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("browser") {
+static_library("ui_zoom") {
   sources = [
-    "cdm_message_filter_android.cc",
-    "cdm_message_filter_android.h",
+    "zoom_controller.cc",
+    "zoom_controller.h",
+    "zoom_event_manager.cc",
+    "zoom_event_manager.h",
+    "zoom_observer.h",
   ]
 
   deps = [
     "//base",
-    "//components/cdm/common",
     "//content/public/browser",
     "//content/public/common",
-    "//media",
+    "//ipc",
+    "//net",
+    "//url",
   ]
 }