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

chrome/browser/android/new_tab_page_prefs.cc

Index: chrome/browser/android/new_tab_page_prefs.cc
diff --git a/chrome/browser/android/new_tab_page_prefs.cc b/chrome/browser/android/new_tab_page_prefs.cc
index 94a4e75f0381b380dac8f39b23daa2ebe374ab02..dacf2ab2917d6e67d4ff234cf696e9c5aa1d8aaf 100644
--- a/chrome/browser/android/new_tab_page_prefs.cc
+++ b/chrome/browser/android/new_tab_page_prefs.cc
@@ -73,7 +73,7 @@ void NewTabPagePrefs::SetSyncPromoCollapsed(JNIEnv* env,
 jboolean NewTabPagePrefs::GetForeignSessionCollapsed(JNIEnv* env,
                                                      jobject obj,
                                                      jstring session_tag) {
-  const DictionaryValue* dict = profile_->GetPrefs()->GetDictionary(
+  const base::DictionaryValue* dict = profile_->GetPrefs()->GetDictionary(
       prefs::kNtpCollapsedForeignSessions);
   return dict && dict->HasKey(ConvertJavaStringToUTF8(env, session_tag));
 }