[inspector] fix use-after-free in ConsoleHelper::reportCall

src/inspector/v8-console.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/inspector/v8-console.h"
 
 #include "src/base/macros.h"
 #include "src/inspector/injected-script.h"
 #include "src/inspector/inspected-context.h"
 #include "src/inspector/string-util.h"
@@ skipping 75 matching lines @@
   void reportCallWithArgument(ConsoleAPIType type, const String16& message) {
     std::vector<v8::Local<v8::Value>> arguments(1,
                                                 toV8String(m_isolate, message));
     reportCall(type, arguments);
   }
 
   void reportCall(ConsoleAPIType type,
                   const std::vector<v8::Local<v8::Value>>& arguments) {
     InspectedContext* inspectedContext = ensureInspectedContext();
     if (!inspectedContext) return;
+    int contextGroupId = inspectedContext->contextGroupId();
     V8InspectorImpl* inspector = inspectedContext->inspector();
     std::unique_ptr<V8ConsoleMessage> message =
         V8ConsoleMessage::createForConsoleAPI(
             inspector->client()->currentTimeMS(), type, arguments,
             inspector->debugger()->captureStackTrace(false), inspectedContext);
-    inspector->ensureConsoleMessageStorage(inspectedContext->contextGroupId())
+    inspector->ensureConsoleMessageStorage(contextGroupId)
         ->addMessage(std::move(message));
   }
 
   void reportDeprecatedCall(const char* id, const String16& message) {
     if (checkAndSetPrivateFlagOnConsole(id, false)) return;
     std::vector<v8::Local<v8::Value>> arguments(1,
                                                 toV8String(m_isolate, message));
     reportCall(ConsoleAPIType::kWarning, arguments);
   }
 
@@ skipping 797 matching lines @@
                          ->GetOwnPropertyDescriptor(
                              m_context, v8::Local<v8::String>::Cast(name))
                          .ToLocal(&descriptor);
       DCHECK(success);
       USE(success);
     }
   }
 }
 
 }  // namespace v8_inspector