Remove hackish way of getting the url for browser testing

tools/testing/dart/test_suite.dart

Index: tools/testing/dart/test_suite.dart
===================================================================
--- tools/testing/dart/test_suite.dart	(revision 23319)
+++ tools/testing/dart/test_suite.dart	(working copy)
@@ -997,6 +997,7 @@
                                                  subtestNames, subtestIndex);
 
         List<String> args = <String>[];
+
         if (TestUtils.usesWebDriver(runtime)) {
           args = [
               dartDir.append('tools/testing/run_selenium.py').toNativePath(),
@@ -1053,18 +1054,20 @@
           testCase = new BrowserTestCase(testDisplayName,
               commandSet, configuration, completeHandler,
               expectations['$testName/${subtestNames[subtestIndex]}'],
-              info, info.hasCompileError || info.hasRuntimeError,
+              info, info.hasCompileError || info.hasRuntimeError, fullHtmlPath,
               subtestIndex != 0);
         } else {
           testCase = new BrowserTestCase(testDisplayName,
               commandSet, configuration, completeHandler, expectations,
-              info, info.hasCompileError || info.hasRuntimeError, false);
+              info, info.hasCompileError || info.hasRuntimeError, fullHtmlPath,
+              false);
         }
         if (subtestIndex == 0) {
           multitestParentTest = testCase;
         } else {
           multitestParentTest.addObserver(testCase);
         }
+
         doTest(testCase);
         subtestIndex++;
       } while(subtestIndex < subtestNames.length);