DevTools: NetworkConditionsEmulation: fix interpretation of incorrect settings.

BUG=456324

Review URL: https://codereview.chromium.org/1039213002

Cr-Commit-Position: refs/heads/master@{#322568}

chrome/browser/devtools/devtools_network_conditions.cc

@@ -35,6 +35,6 @@ DevToolsNetworkConditions::~DevToolsNetworkConditions() {
 }
 
 bool DevToolsNetworkConditions::IsThrottling() const {
-  return (latency_ != 0) || (download_throughput_ != 0.0) ||
-      (upload_throughput_ != 0);
+  return !offline_ && ((latency_ != 0) || (download_throughput_ != 0.0) ||
+      (upload_throughput_ != 0));
 }