[net] Set default HostCache size to 1000 entries.

net/base/host_cache.cc

Index: net/base/host_cache.cc
diff --git a/net/base/host_cache.cc b/net/base/host_cache.cc
index cd98c1dc8fe398a5bc40eebca7fa76372e108b84..32f8c44a19180e2dbb9699bc3bf81cf7ad7f4ec3 100644
--- a/net/base/host_cache.cc
+++ b/net/base/host_cache.cc
@@ -84,12 +84,17 @@ const HostCache::EntryMap& HostCache::entries() const {
 // static
 scoped_ptr<HostCache> HostCache::CreateDefaultCache() {
   // Cache capacity is determined by the field trial.
+#if defined(ENABLE_BUILT_IN_DNS)
+  const size_t kDefaultMaxEntries = 1000;
+#else
+  const size_t kDefaultMaxEntries = 100;
+#endif
   const size_t kSaneMaxEntries = 1 << 20;
   size_t max_entries = 0;
   base::StringToSizeT(base::FieldTrialList::FindFullName("HostCacheSize"),
                       &max_entries);
   if ((max_entries == 0) || (max_entries > kSaneMaxEntries))
-    max_entries = 100;
+    max_entries = kDefaultMaxEntries;
   return make_scoped_ptr(new HostCache(max_entries));
 }