Making almost all dom_ methods private. Exceptions will be addressed in a later CL.

tools/dom/dom.json

 {
   "ANGLEInstancedArrays": {
     "members": {
       "VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE": {
         "support_level": "untriaged"
       },
       "drawArraysInstancedANGLE": {
         "support_level": "untriaged"
       },
       "drawElementsInstancedANGLE": {
@@ skipping 2434 matching lines @@
       "onopen": {},
       "readyState": {},
       "removeEventListener": {},
       "url": {},
       "withCredentials": {}
     },
     "support_level": "stable"
   },
   "EventTarget": {
     "members": {
-      "addEventListener": {},
+      "addEventListener": {
+        "support_level": "deprecated"
+      },
       "dispatchEvent": {},
-      "removeEventListener": {}
+      "removeEventListener": {
+        "support_level": "deprecated"
+      }
     },
     "support_level": "stable"
   },
   "File": {
     "comment": "http://www.w3.org/TR/FileAPI/#dfn-file",
     "members": {
       "lastModifiedDate": {},
       "name": {},
       "webkitRelativePath": {
         "comment": "https://plus.sandbox.google.com/+AddyOsmani/posts/Dk5UhZ6zfF3",
@@ skipping 10129 matching lines @@
       "importStylesheet": {},
       "removeParameter": {},
       "reset": {},
       "setParameter": {},
       "transformToDocument": {},
       "transformToFragment": {}
     },
     "support_level": "nonstandard"
   }
 }