Remove third_party/polymer from .gitignore

third_party/polymer/v1_0/components/paper-header-panel/bower.json

Index: third_party/polymer/v1_0/components/paper-header-panel/bower.json
diff --git a/third_party/polymer/v1_0/components/paper-header-panel/bower.json b/third_party/polymer/v1_0/components/paper-header-panel/bower.json
deleted file mode 100644
index 62efe83654575facfe528a1cd418121bd443e053..0000000000000000000000000000000000000000
--- a/third_party/polymer/v1_0/components/paper-header-panel/bower.json
+++ /dev/null
@@ -1,28 +0,0 @@
-{
-  "name": "paper-header-panel",
-  "version": "1.0.2",
-  "description": "A header and content wrapper for layout with headers",
-  "authors": [
-    "The Polymer Authors"
-  ],
-  "keywords": [
-    "web-components",
-    "polymer",
-    "layout"
-  ],
-  "private": true,
-  "license": "http://polymer.github.io/LICENSE.txt",
-  "homepage": "https://github.com/PolymerElements/paper-header-panel",
-  "ignore": [],
-  "dependencies": {
-    "iron-flex-layout": "PolymerElements/iron-flex-layout#^1.0.0",
-    "polymer": "Polymer/polymer#^1.0.0"
-  },
-  "devDependencies": {
-    "web-component-tester": "*",
-    "iron-component-page": "PolymerElements/iron-component-page#^1.0.0",
-    "test-fixture": "PolymerElements/test-fixture#^1.0.0",
-    "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0",
-    "paper-styles": "PolymerElements/paper-styles#^1.0.0"
-  }
-}