DevTools: fix jsdoc validator to recognize `this' usage within arrow functions

third_party/WebKit/Source/devtools/scripts/jsdoc-validator/tests/golden.dat

 /tests/document.js:1: ERROR - Access to "document" property of global object is disallowed
 document.bar();
 ^
 
 /tests/document.js:2: ERROR - Access to "document" property of global object is disallowed
 window.document.bar();
        ^
 
 /tests/document.js:5: ERROR - Access to "document" property of global object is disallowed
 document();
@@ skipping 244 matching lines @@
                                   ^
 
 /tests/proto.js:62: ERROR - Type DerivedNoSuperCall extends Base but does not properly invoke its constructor
 DerivedNoSuperCall = function() {
 ^
 
 /tests/proto.js:73: ERROR - Type DerivedBadSuperCall extends Base but does not properly invoke its constructor
 DerivedBadSuperCall = function() {
 ^
 
-/tests/proto.js:121: ERROR - No __proto__ assigned for type BadSetSubclass having @extends
+/tests/proto.js:107: ERROR - No __proto__ assigned for type GoodSetSubclass = function()
+{
+    Set.call(this);
+} having @extends
  * @extends {Set.<T>}
              ^
 
-/tests/proto.js:124: ERROR - Type BadSetSubclass extends Set but does not properly invoke its constructor
+/tests/proto.js:121: ERROR - No __proto__ assigned for type BadSetSubclass = function()
+{
+} having @extends
+ * @extends {Set.<T>}
+             ^
+
+/tests/proto.js:124: ERROR - Type BadSetSubclass = function()
+{
+} extends Set but does not properly invoke its constructor
 var BadSetSubclass = function()
     ^
 
 /tests/proto.js:135: ERROR - No __proto__ assigned for type NS.BadSubClass having @extends
  * @extends {Base}
              ^
 
 /tests/proto.js:137: ERROR - Type NS.BadSubClass extends Base but does not properly invoke its constructor
 NS.BadSubClass = function() {}
 ^
@@ skipping 119 matching lines @@
                                           ^
 
 /tests/this.js:268: ERROR - @this annotation is required for functions referencing 'this'
         function callbackReferencingThisNotAnnotated()
                  ^
 
 /tests/this.js:277: ERROR - @this annotation found for function not referencing 'this'
         function callbackNotReferencingThisAnnotated()
                  ^
 
-Total errors: 102
+/tests/this.js:321: ERROR - @this annotation is required for functions referencing 'this'
+        function testArrowFunctionReferencingThisMissingAnnotation(a)
+                 ^
+
+Total errors: 104