Fix crash in tracing for chrome.identity.getAuthToken

chrome/browser/extensions/api/identity/identity_api.cc

 // Copyright (c) 2012 The Chromium 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 "chrome/browser/extensions/api/identity/identity_api.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 270 matching lines @@
     infos->Append(account_info.ToValue().release());
   }
 
   return RespondNow(OneArgument(infos));
 }
 
 IdentityGetAuthTokenFunction::IdentityGetAuthTokenFunction()
     : OAuth2TokenService::Consumer("extensions_identity_api"),
       should_prompt_for_scopes_(false),
       should_prompt_for_signin_(false) {
-  TRACE_EVENT_ASYNC_BEGIN1("identity",
-                           "IdentityGetAuthTokenFunction",
-                           this,
-                           "extension",
-                           extension()->id());
 }
 
 IdentityGetAuthTokenFunction::~IdentityGetAuthTokenFunction() {
   TRACE_EVENT_ASYNC_END0("identity", "IdentityGetAuthTokenFunction", this);
 }
 
 bool IdentityGetAuthTokenFunction::RunAsync() {
+  TRACE_EVENT_ASYNC_BEGIN1("identity",
+                           "IdentityGetAuthTokenFunction",
+                           this,
+                           "extension",
+                           extension()->id());
+
   if (GetProfile()->IsOffTheRecord()) {
     error_ = identity_constants::kOffTheRecord;
     return false;
   }
 
   scoped_ptr<identity::GetAuthToken::Params> params(
       identity::GetAuthToken::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
   bool interactive = params->details.get() &&
       params->details->interactive.get() &&
@@ skipping 630 matching lines @@
 void IdentityLaunchWebAuthFlowFunction::OnAuthFlowURLChange(
     const GURL& redirect_url) {
   if (redirect_url.GetWithEmptyPath() == final_url_prefix_) {
     SetResult(new base::StringValue(redirect_url.spec()));
     SendResponse(true);
     Release();  // Balanced in RunAsync.
   }
 }
 
 }  // namespace extensions