Update some uses of Value in chrome/browser to use the base:: namespace.

chrome/browser/chromeos/login/merge_session_load_page.cc

Index: chrome/browser/chromeos/login/merge_session_load_page.cc
diff --git a/chrome/browser/chromeos/login/merge_session_load_page.cc b/chrome/browser/chromeos/login/merge_session_load_page.cc
index 8f5f321966a5f620880f097f0291c40c5424ac4c..d21c26f37f3e316416a73eefc9fa26a875469108 100644
--- a/chrome/browser/chromeos/login/merge_session_load_page.cc
+++ b/chrome/browser/chromeos/login/merge_session_load_page.cc
@@ -77,7 +77,7 @@ void MergeSessionLoadPage::Show() {
 }
 
 std::string MergeSessionLoadPage::GetHTMLContents() {
-  DictionaryValue strings;
+  base::DictionaryValue strings;
   strings.SetString("title", web_contents_->GetTitle());
   // Set the timeout to show the page.
   strings.SetInteger("show_delay_time", kShowDelayTimeMS);