Add base:: to string16s in chrome/.

chrome/test/chromedriver/chrome/zip_reader.cc

Index: chrome/test/chromedriver/chrome/zip_reader.cc
diff --git a/chrome/test/chromedriver/chrome/zip_reader.cc b/chrome/test/chromedriver/chrome/zip_reader.cc
index 218c8d7e77d57f0a297541b08d2f85695ae0b4e8..71d11f5fd85dad23eb3a8861c3e12ff57a78503e 100644
--- a/chrome/test/chromedriver/chrome/zip_reader.cc
+++ b/chrome/test/chromedriver/chrome/zip_reader.cc
@@ -39,7 +39,7 @@ ZipReader::EntryInfo::EntryInfo(const std::string& file_name_in_zip,
   is_unsafe_ = file_name_in_zip.find("..") != std::string::npos;
 
   // We also consider that the file name is unsafe, if it's invalid UTF-8.
-  string16 file_name_utf16;
+  base::string16 file_name_utf16;
   if (!UTF8ToUTF16(file_name_in_zip.data(), file_name_in_zip.size(),
                    &file_name_utf16)) {
     is_unsafe_ = true;