[Extensions Bindings] Fix getPlatform() method

extensions/renderer/resources/binding.js

Index: extensions/renderer/resources/binding.js
diff --git a/extensions/renderer/resources/binding.js b/extensions/renderer/resources/binding.js
index d0b7e61b5e587c70d03056fce6cd79a72bfa13b6..920345526fdf2cf18bcca46d53691c504c1c9b68 100644
--- a/extensions/renderer/resources/binding.js
+++ b/extensions/renderer/resources/binding.js
@@ -20,6 +20,7 @@ var sendRequestHandler = require('sendRequest');
 var contextType = process.GetContextType();
 var extensionId = process.GetExtensionId();
 var manifestVersion = process.GetManifestVersion();
+var platform = process.GetPlatform();
 var sendRequest = sendRequestHandler.sendRequest;
 
 // Stores the name and definition of each API function, with methods to
@@ -87,24 +88,6 @@ APIFunctions.prototype.setCustomCallback =
   return this.setHook_(apiName, 'customCallback', customizedFunction);
 };
 
-// Get the platform from navigator.appVersion.
-function getPlatform() {
-  var platforms = [
-    [/CrOS Touch/, "chromeos touch"],

[lazyboy, 2017/07/07 23:09:26]

You're also removing "chromeos touch", which is unused as far as I understand.
Archeology gives me this:
https://codereview.chromium.org/7104002/diff/20002/chrome/common/extensions/a...

Mind updating the CL description to also say it removes "chromeos touch"?

[Devlin, 2017/07/10 18:35:31]

Good idea; done.

-    [/CrOS/, "chromeos"],
-    [/Linux/, "linux"],
-    [/Mac/, "mac"],
-    [/Win/, "win"],
-  ];
-
-  for (var i = 0; i < platforms.length; i++) {
-    if ($RegExp.exec(platforms[i][0], navigator.appVersion)) {
-      return platforms[i][1];
-    }
-  }
-  return "unknown";
-}
-
 function isPlatformSupported(schemaNode, platform) {
   return !schemaNode.platforms ||
       $Array.indexOf(schemaNode.platforms, platform) > -1;
@@ -145,8 +128,6 @@ function createCustomType(type) {
   return customType;
 }
 
-var platform = getPlatform();
-
 function Binding(apiName) {
   this.apiName_ = apiName;
   this.apiFunctions_ = new APIFunctions(apiName);