Bounce all requests off the cache lock after 25ms.

net/http/http_cache_transaction.h

Index: net/http/http_cache_transaction.h
diff --git a/net/http/http_cache_transaction.h b/net/http/http_cache_transaction.h
index 3256c1aa548c89128568a158773cd4afa5b8bfec..4952d25d4f8c872fed6c21f50d0762ef587bdb6c 100644
--- a/net/http/http_cache_transaction.h
+++ b/net/http/http_cache_transaction.h
@@ -119,11 +119,6 @@ class HttpCache::Transaction : public HttpTransaction {
 
   const BoundNetLog& net_log() const;
 
-  // Bypasses the cache lock whenever there is lock contention.
-  void BypassLockForTest() {
-    bypass_lock_for_test_ = true;
-  }
-
   // Generates a failure when attempting to conditionalize a network request.
   void FailConditionalizationForTest() {
     fail_conditionalization_for_test_ = true;
@@ -458,7 +453,6 @@ class HttpCache::Transaction : public HttpTransaction {
   bool done_reading_;  // All available data was read.
   bool vary_mismatch_;  // The request doesn't match the stored vary data.
   bool couldnt_conditionalize_request_;
-  bool bypass_lock_for_test_;  // A test is exercising the cache lock.
   bool fail_conditionalization_for_test_;  // Fail ConditionalizeRequest.
   scoped_refptr<IOBuffer> read_buf_;
   int io_buf_len_;