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

chrome/browser/bookmarks/bookmark_storage.cc

Index: chrome/browser/bookmarks/bookmark_storage.cc
diff --git a/chrome/browser/bookmarks/bookmark_storage.cc b/chrome/browser/bookmarks/bookmark_storage.cc
index 53bcb6201629d145af0860306421a898cdb24cdf..c781a8d809db5244409bdce1850201035207ee9f 100644
--- a/chrome/browser/bookmarks/bookmark_storage.cc
+++ b/chrome/browser/bookmarks/bookmark_storage.cc
@@ -56,7 +56,7 @@ void LoadCallback(const base::FilePath& path,
   bool bookmark_file_exists = base::PathExists(path);
   if (bookmark_file_exists) {
     JSONFileValueSerializer serializer(path);
-    scoped_ptr<Value> root(serializer.Deserialize(NULL, NULL));
+    scoped_ptr<base::Value> root(serializer.Deserialize(NULL, NULL));
 
     if (root.get()) {
       // Building the index can take a while, so we do it on the background
@@ -157,7 +157,7 @@ void BookmarkStorage::BookmarkModelDeleted() {
 
 bool BookmarkStorage::SerializeData(std::string* output) {
   BookmarkCodec codec;
-  scoped_ptr<Value> value(codec.Encode(model_));
+  scoped_ptr<base::Value> value(codec.Encode(model_));
   JSONStringValueSerializer serializer(output);
   serializer.set_pretty_print(true);
   return serializer.Serialize(*(value.get()));