[DevTools] Fix telemetry flakiness based on target type

chrome/browser/devtools/chrome_devtools_manager_delegate.cc

 // Copyright 2014 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/devtools/chrome_devtools_manager_delegate.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 347 matching lines @@
     return DevToolsAgentHost::kTypeFrame;
 
   for (TabContentsIterator it; !it.done(); it.Next()) {
     if (*it == web_contents)
       return DevToolsAgentHost::kTypePage;
   }
 
   std::string extension_name;
   std::string extension_type;
   if (!GetExtensionInfo(host, &extension_name, &extension_type))
-    return std::string();
+    return DevToolsAgentHost::kTypeOther;
   return extension_type;
 }
 
 std::string ChromeDevToolsManagerDelegate::GetTargetTitle(
     content::RenderFrameHost* host) {
   std::string extension_name;
   std::string extension_type;
   if (!GetExtensionInfo(host, &extension_name, &extension_type))
     return std::string();
   return extension_name;
@@ skipping 124 matching lines @@
                                                            kLocationsParam);
     }
     tcp_locations.insert(net::HostPortPair(host, port));
   }
 
   host_data_[agent_host]->set_remote_locations(tcp_locations);
   UpdateDeviceDiscovery();
 
   return DevToolsProtocol::CreateSuccessResponse(command_id, nullptr);
 }