Add base:: to string16 in extensions/.

extensions/common/value_builder.cc

Index: extensions/common/value_builder.cc
diff --git a/extensions/common/value_builder.cc b/extensions/common/value_builder.cc
index c32679e326287ff42908388ac3c3bcde6ab6d295..0b257454327360e231bc312cd2ec4aa276a72640 100644
--- a/extensions/common/value_builder.cc
+++ b/extensions/common/value_builder.cc
@@ -34,7 +34,7 @@ DictionaryBuilder& DictionaryBuilder::Set(const std::string& path,
 }
 
 DictionaryBuilder& DictionaryBuilder::Set(const std::string& path,
-                                          const string16& in_value) {
+                                          const base::string16& in_value) {
   dict_->SetWithoutPathExpansion(path, new base::StringValue(in_value));
   return *this;
 }
@@ -79,7 +79,7 @@ ListBuilder& ListBuilder::Append(const std::string& in_value) {
   return *this;
 }
 
-ListBuilder& ListBuilder::Append(const string16& in_value) {
+ListBuilder& ListBuilder::Append(const base::string16& in_value) {
   list_->Append(new base::StringValue(in_value));
   return *this;
 }