Move StartsWith[ASCII] to base namespace.

google_apis/gaia/fake_gaia.cc

Index: google_apis/gaia/fake_gaia.cc
diff --git a/google_apis/gaia/fake_gaia.cc b/google_apis/gaia/fake_gaia.cc
index 4c0db5a15c6561e0efb819d04f06428eed528008..1b5d408ec008c6b7f257432be8f9b1445c08c1ab 100644
--- a/google_apis/gaia/fake_gaia.cc
+++ b/google_apis/gaia/fake_gaia.cc
@@ -102,7 +102,8 @@ bool GetAccessToken(const HttpRequest& request,
   std::map<std::string, std::string>::const_iterator auth_header_entry =
       request.headers.find("Authorization");
   if (auth_header_entry != request.headers.end()) {
-    if (StartsWithASCII(auth_header_entry->second, auth_token_prefix, true)) {
+    if (base::StartsWithASCII(auth_header_entry->second, auth_token_prefix,
+                              true)) {
       *access_token = auth_header_entry->second.substr(
           strlen(auth_token_prefix));
       return true;