Revert recent changes to base::Value

chrome/test/perf/dom_checker_uitest.cc

Index: chrome/test/perf/dom_checker_uitest.cc
diff --git a/chrome/test/perf/dom_checker_uitest.cc b/chrome/test/perf/dom_checker_uitest.cc
index deceb9e1481a816c6c2623fb91a6606c87078cd4..8255a94362d8b6e38433f6ee44138e6b246c93df 100644
--- a/chrome/test/perf/dom_checker_uitest.cc
+++ b/chrome/test/perf/dom_checker_uitest.cc
@@ -175,11 +175,12 @@ class DomCheckerTest : public UITest {
     if (!value.get())
       return false;
 
-    EXPECT_TRUE(value->AsList());
-    ListValue* list_value = value->AsList();
-    if (!list_value)
+    EXPECT_TRUE(value->IsType(Value::TYPE_LIST));
+    if (!value->IsType(Value::TYPE_LIST))
       return false;
 
+    ListValue* list_value = static_cast<ListValue*>(value.get());
+
     // The parsed JSON object will be an array of strings, each of which is a
     // test failure. Add those strings to the results set.
     ListValue::const_iterator it = list_value->begin();