[Webapp Refactor] Move key injection logic into the plugin layer.

remoting/webapp/base/js/application.js

Index: remoting/webapp/base/js/application.js
diff --git a/remoting/webapp/base/js/application.js b/remoting/webapp/base/js/application.js
index 3141ec92bb6e94ee1a31bd9d24f4adc26171d9d7..7289b0eea7cb3ae17b698a009e5b2c1678942ab5 100644
--- a/remoting/webapp/base/js/application.js
+++ b/remoting/webapp/base/js/application.js
@@ -180,8 +180,7 @@ remoting.Application.prototype.getSessionConnector = function() {
         this.onConnected.bind(this),
         this.onError.bind(this),
         this.onConnectionFailed.bind(this),
-        this.appCapabilities_,
-        this.delegate_.getDefaultRemapKeys());
+        this.appCapabilities_);
   }
   return this.sessionConnector_;
 };
@@ -267,11 +266,6 @@ remoting.Application.Delegate.prototype.signInFailed = function(error) {};
 remoting.Application.Delegate.prototype.getApplicationName = function() {};
 
 /**
- * @return {string} The default remap keys for the current platform.
- */
-remoting.Application.Delegate.prototype.getDefaultRemapKeys = function() {};
-
-/**
  * Called when a new session has been connected.
  *
  * @param {remoting.ConnectionInfo} connectionInfo