Move TrimWhitespace to the base namespace.

net/proxy/dhcp_proxy_script_adapter_fetcher_win.cc

Index: net/proxy/dhcp_proxy_script_adapter_fetcher_win.cc
diff --git a/net/proxy/dhcp_proxy_script_adapter_fetcher_win.cc b/net/proxy/dhcp_proxy_script_adapter_fetcher_win.cc
index 738f0c156cdfabc2925cca7b9864a306effeec95..1c1e54b4ab4ddd8719451ed7cd93c9675574bb2e 100644
--- a/net/proxy/dhcp_proxy_script_adapter_fetcher_win.cc
+++ b/net/proxy/dhcp_proxy_script_adapter_fetcher_win.cc
@@ -288,7 +288,7 @@ std::string DhcpProxyScriptAdapterFetcher::SanitizeDhcpApiString(
   // the server is giving us back a buffer with embedded NULLs,
   // something is broken anyway.  Finally, trim trailing whitespace.
   std::string result(std::string(data, count_bytes).c_str());
-  TrimWhitespaceASCII(result, TRIM_TRAILING, &result);
+  base::TrimWhitespaceASCII(result, base::TRIM_TRAILING, &result);
   return result;
 }