Add base:: to string16 in extensions/.

extensions/common/value_builder.h

Index: extensions/common/value_builder.h
diff --git a/extensions/common/value_builder.h b/extensions/common/value_builder.h
index 77b0d73dfc5c803ae54b45b0459ee9aac4e02342..bcb40aa51af17f6e0af37b89a5a43ca7ba8e9f61 100644
--- a/extensions/common/value_builder.h
+++ b/extensions/common/value_builder.h
@@ -59,7 +59,8 @@ class DictionaryBuilder {
   DictionaryBuilder& Set(const std::string& path, int in_value);
   DictionaryBuilder& Set(const std::string& path, double in_value);
   DictionaryBuilder& Set(const std::string& path, const std::string& in_value);
-  DictionaryBuilder& Set(const std::string& path, const string16& in_value);
+  DictionaryBuilder& Set(const std::string& path,
+                         const base::string16& in_value);
   DictionaryBuilder& Set(const std::string& path, DictionaryBuilder& in_value);
   DictionaryBuilder& Set(const std::string& path, ListBuilder& in_value);
 
@@ -87,7 +88,7 @@ class ListBuilder {
   ListBuilder& Append(int in_value);
   ListBuilder& Append(double in_value);
   ListBuilder& Append(const std::string& in_value);
-  ListBuilder& Append(const string16& in_value);
+  ListBuilder& Append(const base::string16& in_value);
   ListBuilder& Append(DictionaryBuilder& in_value);
   ListBuilder& Append(ListBuilder& in_value);