Correct const accessors in base/values.(h|cc)

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 f9df353529f93deacefafa1bbe536a4fc151a370..d6e9d7e0398fe73097f4398da374a3e28639e671 100644
--- a/chrome/test/webdriver/commands/webelement_commands.cc
+++ b/chrome/test/webdriver/commands/webelement_commands.cc
@@ -25,7 +25,7 @@ namespace webdriver {
 
 WebElementCommand::WebElementCommand(
     const std::vector<std::string>& path_segments,
-    const DictionaryValue* const parameters)
+    DictionaryValue* const parameters)
     : WebDriverCommand(path_segments, parameters),
       path_segments_(path_segments) {}
 
@@ -531,7 +531,7 @@ Error* ElementValueCommand::HasAttributeWithLowerCaseValueASCII(
 }
 
 Error* ElementValueCommand::DragAndDropFilePaths() const {
-  ListValue* path_list;
+  const ListValue* path_list;
   if (!GetListParameter("value", &path_list))
     return new Error(kBadRequest, "Missing or invalid 'value' parameter");
 
@@ -579,7 +579,7 @@ Error* ElementValueCommand::DragAndDropFilePaths() const {
 }
 
 Error* ElementValueCommand::SendKeys() const {
-  ListValue* key_list;
+  const ListValue* key_list;
   if (!GetListParameter("value", &key_list)) {
     return new Error(kBadRequest, "Missing or invalid 'value' parameter");
   }