base: Add Is* functions to Value class.

chrome/test/webdriver/commands/webelement_commands.cc

Index: chrome/test/webdriver/commands/webelement_commands.cc
diff --git a/chrome/test/webdriver/commands/webelement_commands.cc b/chrome/test/webdriver/commands/webelement_commands.cc
index 2971a678f5b5017fb8bf810cd0f42047e02c4507..7a1fdd695fe5a6a5f00dfce5b98d2dff170c1bb0 100644
--- a/chrome/test/webdriver/commands/webelement_commands.cc
+++ b/chrome/test/webdriver/commands/webelement_commands.cc
@@ -469,8 +469,7 @@ void ElementValueCommand::ExecuteGet(Response* const response) {
     response->SetError(error);
     return;
   }
-  if (!result->IsType(Value::TYPE_STRING) &&
-      !result->IsType(Value::TYPE_NULL)) {
+  if (!result->IsString() && !result->IsNull()) {
     response->SetError(new Error(
         kUnknownError, "Result is not string or null type"));
     return;
@@ -624,7 +623,7 @@ void ElementTextCommand::ExecuteGet(Response* const response) {
     response->SetError(error);
     return;
   }
-  if (!result->IsType(Value::TYPE_STRING)) {
+  if (!result->IsString()) {
     response->SetError(new Error(kUnknownError, "Result is not string type"));
     return;
   }