Migrate WTF::HashMap::get() to ::at()

third_party/WebKit/Source/core/inspector/InspectorWorkerAgent.cpp

Index: third_party/WebKit/Source/core/inspector/InspectorWorkerAgent.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorWorkerAgent.cpp b/third_party/WebKit/Source/core/inspector/InspectorWorkerAgent.cpp
index 3847a722a70a61ca8acc45be3e380aedc60c7d0a..7e0d22a193ddd8b4bc843355785e81a528ca4a80 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorWorkerAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorWorkerAgent.cpp
@@ -89,7 +89,7 @@ bool InspectorWorkerAgent::autoAttachEnabled() {
 
 Response InspectorWorkerAgent::sendMessageToTarget(const String& targetId,
                                                    const String& message) {
-  WorkerInspectorProxy* proxy = m_connectedProxies.get(targetId);
+  WorkerInspectorProxy* proxy = m_connectedProxies.at(targetId);
   if (!proxy)
     return Response::Error("Not attached to a target with given id");
   proxy->sendMessageToInspector(message);