PVS-Studio warning V595 for Chromium

void TestingAutomationProvider::IsPageActionVisible(
    base::DictionaryValue* args,
    IPC::Message* reply_message) {
  ....
  Browser* browser = automation_util::GetBrowserForTab(tab);
  const Extension* extension;
  if (!GetEnabledExtensionFromJSONArgs(
          ...., browser->profile(), ....)) {
    reply.SendError(error);
    return;
  }
  if (!browser) {
    reply.SendError("Tab does not belong to an open browser");
    return;
  }
  ....
}

This suspicious code was found in Chromium project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'browser' pointer was utilized before it was verified against nullptr. Check lines: 5489, 5493. testing_automation_provider.cc 5489

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/