Bounce all requests off the cache lock after 25ms.

net/http/http_cache.h

Index: net/http/http_cache.h
diff --git a/net/http/http_cache.h b/net/http/http_cache.h
index c960bbd6d457b2330eebfa761b260ef4cfd96dc1..85fa4d30b1a032b2dd2134c6bbcb7ab2d45c4b81 100644
--- a/net/http/http_cache.h
+++ b/net/http/http_cache.h
@@ -200,12 +200,6 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory,
   // referred to by |url| and |http_method|.
   void OnExternalCacheHit(const GURL& url, const std::string& http_method);
 
-  // Causes all transactions created after this point to effectively bypass
-  // the cache lock whenever there is lock contention.
-  void BypassLockForTest() {
-    bypass_lock_for_test_ = true;
-  }
-
   // Causes all transactions created after this point to generate a failure
   // when attempting to conditionalize a network request.
   void FailConditionalizationForTest() {
@@ -410,7 +404,6 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory,
   // Used when lazily constructing the disk_cache_.
   scoped_ptr<BackendFactory> backend_factory_;
   bool building_backend_;
-  bool bypass_lock_for_test_;
   bool fail_conditionalization_for_test_;
 
   Mode mode_;