DevTools: Add tooltip hint about overrides

Change-Id: If85c60d7f52cdc0a3acc8addf9d7e1995195295b
Reviewed-on: https://chromium-review.googlesource.com/1046106Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Paul Irish <paulirish@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557194}

third_party/blink/renderer/devtools/front_end/mobile_throttling/NetworkPanelIndicator.js

@@ -20,7 +20,7 @@ MobileThrottling.NetworkPanelIndicator = class {
         icon.title = Common.UIString('Network throttling is enabled');
       } else if (SDK.multitargetNetworkManager.isIntercepting()) {
         icon = UI.Icon.create('smallicon-warning');
-        icon.title = Common.UIString('Requests may be rewritten');
+        icon.title = Common.UIString('Requests may be rewritten by local overrides');
       } else if (manager.isBlocking()) {
         icon = UI.Icon.create('smallicon-warning');
         icon.title = Common.UIString('Requests may be blocked');