Fix the problem that m_url is not renewed in WebRequest::OnReceivedRedirect().

[Phenomenon]
  "Security warning" dialog is not displayed at SSL site
  using self-signed certification.

[Cause]
  Although ssl authentication error in redirection destination url,
  m_url(managed in Webkit) is still redirection origin url.
webkit: workaround incompatible operand types

Works around the following:
error: incompatible operand types ('WebCore::RenderStyle *' and 'bool')

Change-Id: Ic87e958d9bc06ce0a3ae203c8b4812d0e3a2aaef