base: Add three helper functions to Values API.

chrome/common/common_param_traits_unittest.cc

Index: chrome/common/common_param_traits_unittest.cc
diff --git a/chrome/common/common_param_traits_unittest.cc b/chrome/common/common_param_traits_unittest.cc
index bc4741873a54366eaf196fd54df7d1f1f20ce0b6..d95c2780812307a9329463f60cb687a1cefb8720 100644
--- a/chrome/common/common_param_traits_unittest.cc
+++ b/chrome/common/common_param_traits_unittest.cc
@@ -119,7 +119,7 @@ TEST(IPCMessageTest, ListValue) {
   ListValue input;
   input.Set(0, Value::CreateDoubleValue(42.42));
   input.Set(1, Value::CreateStringValue("forty"));
-  input.Set(2, Value::CreateNullValue());
+  input.Set(2, base::NullValue());
 
   IPC::Message msg(1, 2, IPC::Message::PRIORITY_NORMAL);
   IPC::WriteParam(&msg, input);
@@ -139,13 +139,13 @@ TEST(IPCMessageTest, ListValue) {
 
 TEST(IPCMessageTest, DictionaryValue) {
   DictionaryValue input;
-  input.Set("null", Value::CreateNullValue());
-  input.Set("bool", Value::CreateBooleanValue(true));
+  input.Set("null", base::NullValue());
+  input.Set("bool", base::TrueValue());
   input.Set("int", Value::CreateIntegerValue(42));
 
   scoped_ptr<DictionaryValue> subdict(new DictionaryValue());
   subdict->Set("str", Value::CreateStringValue("forty two"));
-  subdict->Set("bool", Value::CreateBooleanValue(false));
+  subdict->Set("bool", base::FalseValue());
 
   scoped_ptr<ListValue> sublist(new ListValue());
   sublist->Set(0, Value::CreateDoubleValue(42.42));