[foozzie] Use simpler date mock

The previous method was too brittle as applying a variable number of arguments to Date can be manipulated in too many ways, e.g. concat and apply semantics.

The new method shoud suffice for most cases.

BUG=chromium:698305
NOTRY=true
TBR=yangguo@chromium.org,mstarzinger@chromium.org

Change-Id: If6baf6ca8f1534c41ab8c50a5c507df89fbf0d16
Reviewed-on: https://chromium-review.googlesource.com/449653Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43601}

tools/foozzie/v8_mock.js

@@ -31,13 +31,24 @@ var __PrettyPrint = function __PrettyPrint(msg) { print(msg); };
     return mockDate
   }
 
-  var origConcat = Array.prototype.concat
   var origDate = Date;
   var constructDate = function(args) {
-    if (args.length > 0) {
-      var result = new (
-          Function.prototype.bind.apply(
-              origDate, origConcat.apply([null], args)));
+    if (args.length == 1) {
+      var result = new origDate(args[0]);
+    } else if (args.length == 2) {
+      var result = new origDate(args[0], args[1]);
+    } else if (args.length == 3) {
+      var result = new origDate(args[0], args[1], args[2]);
+    } else if (args.length == 4) {
+      var result = new origDate(args[0], args[1], args[2], args[3]);
+    } else if (args.length == 5) {
+      var result = new origDate(args[0], args[1], args[2], args[3], args[4]);
+    } else if (args.length == 6) {
+      var result = new origDate(
+          args[0], args[1], args[2], args[3], args[4], args[5]);
+    } else if (args.length >= 7) {
+      var result = new origDate(
+          args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
     } else {
       var result = new origDate(mockDateNow());
     }