Move RemoveChars, ReplaceChars, TrimString, and TruncateUTF8ToByteSize to base namespace.

net/http/http_network_transaction_unittest.cc

Index: net/http/http_network_transaction_unittest.cc
diff --git a/net/http/http_network_transaction_unittest.cc b/net/http/http_network_transaction_unittest.cc
index 00295419b930c9fe48b6d7640ca838ec66833ddf..18abdea7bbab00be2d94a041d35ced7a2ef92f3e 100644
--- a/net/http/http_network_transaction_unittest.cc
+++ b/net/http/http_network_transaction_unittest.cc
@@ -112,7 +112,7 @@ bool GetHeaders(base::DictionaryValue* params, std::string* headers) {
     return false;
   std::string double_quote_headers;
   base::JSONWriter::Write(header_list, &double_quote_headers);
-  ReplaceChars(double_quote_headers, "\"", "'", headers);
+  base::ReplaceChars(double_quote_headers, "\"", "'", headers);
   return true;
 }