Adds custom ttl argument to HostCache::Set.

net/proxy/proxy_resolver_v8.cc

Index: net/proxy/proxy_resolver_v8.cc
diff --git a/net/proxy/proxy_resolver_v8.cc b/net/proxy/proxy_resolver_v8.cc
index 92beb80c4588606749b2701a522d219726c1dd14..1fb2e2d364b6750c8e4d53f7267fc4062fabf29b 100644
--- a/net/proxy/proxy_resolver_v8.cc
+++ b/net/proxy/proxy_resolver_v8.cc
@@ -742,12 +742,10 @@ int ProxyResolverV8::GetProxyForURL(
   // available to any of the javascript "bindings" that are subsequently invoked
   // from the javascript.
   //
-  // In particular, we create a HostCache that is aggressive about caching
-  // failed DNS resolves.
-  HostCache host_cache(
-      50,
-      base::TimeDelta::FromMinutes(5),
-      base::TimeDelta::FromMinutes(5));
+  // In particular, we create a HostCache to aggressively cache failed DNS
+  // resolves.
+  const unsigned kMaxCacheEntries = 50;
+  HostCache host_cache(kMaxCacheEntries);
 
   ProxyResolverRequestContext request_context(&net_log, &host_cache);