Do not call GenerateCacheKey() if disk cache is disabled.

net/http/http_cache.cc

Index: net/http/http_cache.cc
diff --git a/net/http/http_cache.cc b/net/http/http_cache.cc
index a167e3200d5d3b44f1e47f70f9610cf698c14bb9..6d4fec01d869d7d2ecbb8a81981b429faa1a3810 100644
--- a/net/http/http_cache.cc
+++ b/net/http/http_cache.cc
@@ -603,7 +603,7 @@ void HttpCache::CloseIdleConnections() {
 
 void HttpCache::OnExternalCacheHit(const GURL& url,
                                    const std::string& http_method) {
-  if (!disk_cache_.get())
+  if (!disk_cache_.get() || mode_ == DISABLE)
     return;
 
   HttpRequestInfo request_info;
@@ -805,7 +805,7 @@ int HttpCache::AsyncDoomEntry(const std::string& key, Transaction* trans) {
 }
 
 void HttpCache::DoomMainEntryForUrl(const GURL& url) {
-  if (!disk_cache_)
+  if (!disk_cache_ || mode_ == DISABLE)

[rvargas (doing something else), 2014/12/04 02:35:14]

This one should not be needed. (it is already covered by the only caller)

     return;
 
   HttpRequestInfo temp_info;