Remove checks for a crasher in PasswordForm.

The associated bug got closed, the crash is no longer observed since version
43, so the checks are overdue to be removed.

BUG=486931,510952
R=vasilii@chromium.org

Review URL: https://codereview.chromium.org/1636813003

Cr-Commit-Position: refs/heads/master@{#371507}

chrome/browser/ui/passwords/manage_passwords_state.cc

@@ -152,8 +152,7 @@ void ManagePasswordsState::OnAutomaticPasswordSave(
 void ManagePasswordsState::OnPasswordAutofilled(
     const PasswordFormMap& password_form_map,
     const GURL& origin) {
-  // TODO(vabr): Revert back to DCHECK once http://crbug.com/486931 is fixed.
-  CHECK(!password_form_map.empty());
+  DCHECK(!password_form_map.empty());
   ClearData();
   if (password_form_map.begin()->second->is_public_suffix_match) {
     // Don't show the UI for PSL matched passwords. They are not stored for this

components/autofill/core/common/password_form.cc

@@ -83,13 +83,10 @@ PasswordForm::PasswordForm()
       skip_zero_click(false),
       layout(Layout::LAYOUT_OTHER),
       was_parsed_using_autofill_predictions(false),
-      is_alive(true),
       is_public_suffix_match(false),
       is_affiliation_based_match(false) {}
 
 PasswordForm::~PasswordForm() {
-  CHECK(is_alive);
-  is_alive = false;
 }
 
 bool PasswordForm::IsPossibleChangePasswordForm() const {

components/autofill/core/common/password_form.h

@@ -259,9 +259,6 @@ struct PasswordForm {
   // If true, this form was parsed using Autofill predictions.
   bool was_parsed_using_autofill_predictions;
 
-  // TODO(vabr): Remove |is_alive| once http://crbug.com/486931 is fixed.
-  bool is_alive;  // Set on construction, reset on destruction.
-
   // If true, this match was found using public suffix matching.
   bool is_public_suffix_match;