Adding platform support check for NetworkObserver

net/base/network_change_notifier.cc

Index: net/base/network_change_notifier.cc
diff --git a/net/base/network_change_notifier.cc b/net/base/network_change_notifier.cc
index fb480e9705f2c418b32ca57a2e80888fd9c20aa0..33aaa9e7d87b68cbd2ba5ab8d37dfc7ffac0a461 100644
--- a/net/base/network_change_notifier.cc
+++ b/net/base/network_change_notifier.cc
@@ -801,6 +801,18 @@ NetworkChangeNotifier* NetworkChangeNotifier::CreateMock() {
   return new MockNetworkChangeNotifier();
 }
 
+bool NetworkChangeNotifier::IsNetworkObserverSupported() {
+#if defined(OS_ANDROID)
+  // Notifications for NetworkObserver only implemented for Android
+  // versions >= L.
+  if (base::android::BuildInfo::GetInstance()->sdk_int() >=
+      base::android::SDK_VERSION_LOLLIPOP) {
+    return true;

[Ryan Hamilton, 2015/11/19 02:19:04]

FWIW, you can just do:

return base::android::BuildInfo::GetInstance()->sdk_int() >=
       base::android::SDK_VERSION_LOLLIPOP;

[Jana, 2015/11/19 03:25:19]

Done.

+  }
+#endif
+  return false;
+}
+
 void NetworkChangeNotifier::AddIPAddressObserver(IPAddressObserver* observer) {
   if (g_network_change_notifier)
     g_network_change_notifier->ip_address_observer_list_->AddObserver(observer);