Fix test failure in list_selection_model_test.html and port to automated browser test.

chrome/test/data/webui/webui_resource_test.js

Index: chrome/test/data/webui/webui_resource_test.js
diff --git a/chrome/test/data/webui/webui_resource_test.js b/chrome/test/data/webui/webui_resource_test.js
index 1cd3aececc419ad5a203ebd29e5c470051e5fc48..53c96523dccf0384a72381e4f822081798756a5e 100644
--- a/chrome/test/data/webui/webui_resource_test.js
+++ b/chrome/test/data/webui/webui_resource_test.js
@@ -72,6 +72,30 @@ function assertThrows(f) {
 }
 
 /**
+ * Verifies that the contents of the expected and observed arrays match.
+ * @param {Array} expected The expected result.

[Dan Beam, 2013/06/20 21:38:03]

!Array

[kevers, 2013/06/21 13:30:49]

Done.

+ * @param {Array} observed The actual result.
+ */
+function assertArrayEquals(expected, observed) {
+  var v1 = Array.prototype.slice.call(expected);

[Dan Beam, 2013/06/20 21:38:03]

Array.prototype.slice.call(null)
TypeError: Array.prototype.slice called on null or undefined

+  var v2 = Array.prototype.slice.call(observed);
+  var equal = v1.length == v2.length;
+  if (equal) {
+    for (var i = 0; i < v1.length; i++) {
+      if (v1[i] !== v2[i]) {
+        equal = false;
+        break;
+      }
+    }
+  }
+  if (!equal) {
+    var message = 'Assertion Failed\n  Observed: ' + v2 +
+        '\n  Expected: ' + v1;
+    throw new Error(message);
+  }
+}
+
+/**
  * Runs all functions starting with test and reports success or
  * failure of the test suite.
  */