Fixing names of password_manager kEnableManualFallbacksFilling feature.

Fixing  names of password_manager kEnableManualFallbacksFilling feature
as per the naming convention.

Bug: 785953
Change-Id: I4a4baa1649fe9f02c3783a5e4c40bc75e717cc03
Reviewed-on: https://chromium-review.googlesource.com/900566
Reviewed-by: Vaclav Brozek <vabr@chromium.org>
Commit-Queue: NIKHIL SAHNI <nikhil.sahni@samsung.com>
Cr-Commit-Position: refs/heads/master@{#534923}
void PasswordAutofillManager::OnAddPasswordFormMapping(
    int key,
    const autofill::PasswordFormFillData& fill_data) {
  if (!autofill::IsValidPasswordFormFillData(fill_data))
    return;

  login_to_password_info_[key] = fill_data;
}

void PasswordAutofillManager::OnAddPasswordFormMapping(
    int key,
    const autofill::PasswordFormFillData& fill_data) {
  if (!autofill::IsValidPasswordFormFillData(fill_data))
    return;

  login_to_password_info_[key] = fill_data;
}
