Small cleanups to ported QuicServer and dependencies

net/quic/quic_in_memory_cache.cc

Index: net/quic/quic_in_memory_cache.cc
diff --git a/net/quic/quic_in_memory_cache.cc b/net/quic/quic_in_memory_cache.cc
index 58c6e90f89cd6c1a77f6feb6bc299b9ed8a842ba..48c45285e940c57b34d78067b3f2a429cf2c19ef 100644
--- a/net/quic/quic_in_memory_cache.cc
+++ b/net/quic/quic_in_memory_cache.cc
@@ -21,7 +21,7 @@ using std::string;
 
 namespace net {
 
-FilePath::StringType g_quic_in_memory_cache_dir = FILE_PATH_LITERAL("");
+FilePath::StringType* g_quic_in_memory_cache_dir = NULL;
 
 QuicInMemoryCache::Response::Response() : response_type_(REGULAR_RESPONSE) {
 }
@@ -98,14 +98,14 @@ void QuicInMemoryCache::ResetForTests() {
 
 void QuicInMemoryCache::Initialize() {
   // If there's no defined cache dir, we have no initialization to do.
-  if (g_quic_in_memory_cache_dir.size() == 0) {
+  if (g_quic_in_memory_cache_dir == NULL) {
     VLOG(1) << "No cache directory found. Skipping initialization.";
     return;
   }
   VLOG(1) << "Attempting to initialize QuicInMemoryCache from directory: "
-          << g_quic_in_memory_cache_dir;
+          << *g_quic_in_memory_cache_dir;
 
-  FilePath directory(g_quic_in_memory_cache_dir);
+  FilePath directory(*g_quic_in_memory_cache_dir);
   base::FileEnumerator file_list(directory,
                                  true,
                                  base::FileEnumerator::FILES);