Revert "add base optional object observe transformer"

This reverts commit b619e843a9.

lib/6to5/file.js

@@ -36,22 +36,12 @@ File.helpers = [
   "interop-require-wildcard",
   "typeof",
   "extends",
-  "get",
-  "observe-delete",
-  "observe-get",
-  "observe-update",
-  "observe-notify",
-  "observe-create"
+  "get"
 ];
 
 File.excludeHelpersFromRuntime = [
   "async-to-generator",
-  "typeof",
-  "observe-delete",
-  "observe-get",
-  "observe-update",
-  "observe-notify",
-  "observe-create"
+  "typeof"
 ];
 
 File.normaliseOptions = function (opts) {

lib/6to5/transformation/templates/observe-create.js

@@ -1,4 +0,0 @@
-(function (obj, callback) {
-  global._6to5Obsevers = global._6to5Obsevers || [];
-  global._6to5Obsevers.push([obj, callback]);
-});

lib/6to5/transformation/templates/observe-delete.js

@@ -1,3 +0,0 @@
-(function () {
-
-})

lib/6to5/transformation/templates/observe-get.js

@@ -1,3 +0,0 @@
-(function () {
-
-})

lib/6to5/transformation/templates/observe-notify.js

@@ -1,3 +0,0 @@
-(function () {
-
-})

lib/6to5/transformation/templates/observe-update.js

@@ -1,3 +0,0 @@
-(function () {
-
-})

lib/6to5/transformation/transform.js

@@ -80,7 +80,6 @@ _.each({
   generators:                require("./transformers/es6-generators"),
   restParameters:            require("./transformers/es6-rest-parameters"),
 
-  objectObserve:             require("./transformers/optional-object-observe"),
   protoToAssign:             require("./transformers/optional-proto-to-assign"),
 
   _declarations:             require("./transformers/_declarations"),

lib/6to5/transformation/transformers/optional-object-observe.js

@@ -1 +0,0 @@
-exports.optional = true;