Enable 'gn check' for some network components that were cleaned up re…

…cently.

These ones pass 'gn check out-gn/Release' on Linux.

BUG=367595,376000
TBR=brettw@chromium.org

Review URL: https://codereview.chromium.org/1429143002

Cr-Commit-Position: refs/heads/master@{#357552}

.gn

@@ -111,9 +111,9 @@ check_targets = [
   #"//components/nacl/*",
   #"//components/navigation_interception/*",
   #"//components/navigation_metrics/*",
-  #"//components/net_log/*",
+  "//components/net_log/*",
   #"//components/network_hints/*",
-  #"//components/network_time/*",
+  "//components/network_time/*",
   #"//components/offline_pages/*",
   #"//components/omnibox/*",
   #"//components/onc/*",