Move StartsWith[ASCII] to base namespace.

net/tools/quic/quic_in_memory_cache.cc

Index: net/tools/quic/quic_in_memory_cache.cc
diff --git a/net/tools/quic/quic_in_memory_cache.cc b/net/tools/quic/quic_in_memory_cache.cc
index cb90bb56534f00f12dc704b128ea8e92bc1b1a08..62b7fbd90c5291ac868e5fd72a8c072094135dae 100644
--- a/net/tools/quic/quic_in_memory_cache.cc
+++ b/net/tools/quic/quic_in_memory_cache.cc
@@ -121,9 +121,9 @@ void QuicInMemoryCache::InitializeFromDirectory(const string& cache_directory) {
     if (response_headers->GetNormalizedHeader("X-Original-Url", &base)) {
       response_headers->RemoveHeader("X-Original-Url");
       // Remove the protocol so we can add it below.
-      if (StartsWithASCII(base, "https://", false)) {
+      if (base::StartsWithASCII(base, "https://", false)) {
         base = base.substr(8);
-      } else if (StartsWithASCII(base, "http://", false)) {
+      } else if (base::StartsWithASCII(base, "http://", false)) {
         base = base.substr(7);
       }
     } else {