Remove Chromium's custom closure runner.

third_party/closure_compiler/externs/chrome_extensions.js

Index: third_party/closure_compiler/externs/chrome_extensions.js
diff --git a/third_party/closure_compiler/externs/chrome_extensions.js b/third_party/closure_compiler/externs/chrome_extensions.js
index 1c4e6f111f5779a51bc9a236c74acffbeea9a294..ac0cd611d8bf415497619f6ffd31f839b6897000 100644
--- a/third_party/closure_compiler/externs/chrome_extensions.js
+++ b/third_party/closure_compiler/externs/chrome_extensions.js
@@ -49,7 +49,7 @@
  * The best practices for each are described in more detail below.  It
  * should be noted that, due to historical reasons, and the evolutionary
  * nature of this file, much this file currently violates the best practices
- * described below. As changed are made, the changes should adhere to the
+ * described below. As changes are made, the changes should adhere to the
  * best practices.
  *
  * A. When to Add Packages to this File?
@@ -126,7 +126,7 @@
  * Always qualify the type name to reduce top-level pollution in this file:
  *
  *   Do:
- *        chrome.extension.Port = function() {}
+ *        chrome.runtime.Port = function() {}
  *   Don't:
  *        function Port() {}
  *
@@ -6589,7 +6589,6 @@ function Debuggee() {}
 Debuggee.prototype.tabId;
 
 
-
 /**
  * @see https://developer.chrome.com/extensions/contentSettings.html#type-ResourceIdentifier
  * @constructor