Move StartsWith[ASCII] to base namespace.

net/test/embedded_test_server/embedded_test_server.cc

Index: net/test/embedded_test_server/embedded_test_server.cc
diff --git a/net/test/embedded_test_server/embedded_test_server.cc b/net/test/embedded_test_server/embedded_test_server.cc
index a6e95ae136d6f3c0d4839344b0d8d722ad1b8cc1..e90ff2c1b4e12870d80985a265af7eb375cebe02 100644
--- a/net/test/embedded_test_server/embedded_test_server.cc
+++ b/net/test/embedded_test_server/embedded_test_server.cc
@@ -263,7 +263,7 @@ void EmbeddedTestServer::HandleRequest(HttpConnection* connection,
 
 GURL EmbeddedTestServer::GetURL(const std::string& relative_url) const {
   DCHECK(Started()) << "You must start the server first.";
-  DCHECK(StartsWithASCII(relative_url, "/", true /* case_sensitive */))
+  DCHECK(base::StartsWithASCII(relative_url, "/", true /* case_sensitive */))
       << relative_url;
   return base_url_.Resolve(relative_url);
 }