Inherits SupportsWeakPtr<T> instead of having WeakPtrFactory<T>

This change refines r137676.

BUG=122654
TEST=browser_test


Review URL: https://chromiumcodereview.appspot.com/10332233

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@139771 0039d316-1c4b-4281-b951-d872f2087c98
void SSLErrorHandler::TakeNoAction() {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));

  BrowserThread::PostTask(
      BrowserThread::IO, FROM_HERE,
      base::Bind(&SSLErrorHandler::CompleteTakeNoAction, this));
}

void SSLErrorHandler::TakeNoAction() {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));

  BrowserThread::PostTask(
      BrowserThread::IO, FROM_HERE,
      base::Bind(&SSLErrorHandler::CompleteTakeNoAction, this));
}
