Remove third_party/polymer from .gitignore

third_party/polymer/v1_0/components/iron-menu-behavior/bower.json

Index: third_party/polymer/v1_0/components/iron-menu-behavior/bower.json
diff --git a/third_party/polymer/v1_0/components/iron-menu-behavior/bower.json b/third_party/polymer/v1_0/components/iron-menu-behavior/bower.json
deleted file mode 100644
index f0d453c1bde9dac9a8564b15d3bd982b38598242..0000000000000000000000000000000000000000
--- a/third_party/polymer/v1_0/components/iron-menu-behavior/bower.json
+++ /dev/null
@@ -1,32 +0,0 @@
-{
-  "name": "iron-menu-behavior",
-  "version": "1.0.1",
-  "description": "Provides accessible menu behavior",
-  "authors": "The Polymer Authors",
-  "keywords": [
-    "web-components",
-    "polymer",
-    "behavior",
-    "menu"
-  ],
-  "main": "iron-menu-behavior.html",
-  "private": true,
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/PolymerElements/iron-menu-behavior"
-  },
-  "license": "http://polymer.github.io/LICENSE.txt",
-  "homepage": "https://github.com/PolymerElements/iron-menu-behavior",
-  "ignore": [],
-  "dependencies": {
-    "iron-selector": "PolymerElements/iron-selector#^1.0.0",
-    "polymer": "Polymer/polymer#^1.0.0",
-    "iron-a11y-keys-behavior": "polymerelements/iron-a11y-keys-behavior#^1.0.0"
-  },
-  "devDependencies": {
-    "iron-component-page": "PolymerElements/iron-component-page#^1.0.0",
-    "test-fixture": "PolymerElements/test-fixture#^1.0.0",
-    "web-component-tester": "*",
-    "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
-  }
-}