DevTools: use shorthand syntax in interface definitions.

third_party/WebKit/Source/devtools/front_end/sdk/TracingModel.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/TracingModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/TracingModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/TracingModel.js
index 1bc28ab85613518d94c33d51bd001c04bdf0375c..3d19b81b28d0ec84835f74a75cd0fefd95674018 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/TracingModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/TracingModel.js
@@ -462,17 +462,17 @@ SDK.BackingStorage.prototype = {
   /**
    * @param {string} string
    */
-  appendString: function(string) {},
+  appendString(string) {},
 
   /**
    * @param {string} string
    * @return {function():!Promise.<?string>}
    */
-  appendAccessibleString: function(string) {},
+  appendAccessibleString(string) {},
 
-  finishWriting: function() {},
+  finishWriting() {},
 
-  reset: function() {},
+  reset() {},
 };
 
 /**