Move StartsWith[ASCII] to base namespace.

net/http/http_response_headers.cc

Index: net/http/http_response_headers.cc
diff --git a/net/http/http_response_headers.cc b/net/http/http_response_headers.cc
index 257a88c9b20cf282460f16752f26bda39a68880d..e729db3b9aa9a233e8c0097b41453528ec0441c8 100644
--- a/net/http/http_response_headers.cc
+++ b/net/http/http_response_headers.cc
@@ -102,8 +102,8 @@ bool ShouldUpdateHeader(const std::string::const_iterator& name_begin,
       return false;
   }
   for (size_t i = 0; i < arraysize(kNonUpdatedHeaderPrefixes); ++i) {
-    if (StartsWithASCII(std::string(name_begin, name_end),
-                        kNonUpdatedHeaderPrefixes[i], false))
+    if (base::StartsWithASCII(std::string(name_begin, name_end),
+                              kNonUpdatedHeaderPrefixes[i], false))
       return false;
   }
   return true;