Revert of Limit form-less Autofilling to pages that look like checkout pages.

components/autofill/core/common/autofill_regexes.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "components/autofill/core/common/autofill_regexes.h"
-
-#include "base/containers/scoped_ptr_hash_map.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/singleton.h"
-#include "base/strings/string16.h"
-#include "third_party/icu/source/i18n/unicode/regex.h"
-
-namespace {
-
-// A singleton class that serves as a cache of compiled regex patterns.
-class AutofillRegexes {
- public:
-  static AutofillRegexes* GetInstance();
-
-  // Returns the compiled regex matcher corresponding to |pattern|.
-  icu::RegexMatcher* GetMatcher(const base::string16& pattern);
-
- private:
-  AutofillRegexes();
-  ~AutofillRegexes();
-  friend struct DefaultSingletonTraits<AutofillRegexes>;
-
-  // Maps patterns to their corresponding regex matchers.
-  base::ScopedPtrHashMap<base::string16, icu::RegexMatcher> matchers_;
-
-  DISALLOW_COPY_AND_ASSIGN(AutofillRegexes);
-};
-
-// static
-AutofillRegexes* AutofillRegexes::GetInstance() {
-  return Singleton<AutofillRegexes>::get();
-}
-
-AutofillRegexes::AutofillRegexes() {
-}
-
-AutofillRegexes::~AutofillRegexes() {
-}
-
-icu::RegexMatcher* AutofillRegexes::GetMatcher(const base::string16& pattern) {
-  auto it = matchers_.find(pattern);
-  if (it == matchers_.end()) {
-    const icu::UnicodeString icu_pattern(pattern.data(), pattern.length());
-
-    UErrorCode status = U_ZERO_ERROR;
-    scoped_ptr<icu::RegexMatcher> matcher(
-        new icu::RegexMatcher(icu_pattern, UREGEX_CASE_INSENSITIVE, status));
-    DCHECK(U_SUCCESS(status));
-
-    auto result = matchers_.add(pattern, matcher.Pass());
-    DCHECK(result.second);
-    it = result.first;
-  }
-  return it->second;
-}
-
-}  // namespace
-
-namespace autofill {
-
-bool MatchesPattern(const base::string16& input,
-                    const base::string16& pattern) {
-  icu::RegexMatcher* matcher =
-      AutofillRegexes::GetInstance()->GetMatcher(pattern);
-  icu::UnicodeString icu_input(input.data(), input.length());
-  matcher->reset(icu_input);
-
-  UErrorCode status = U_ZERO_ERROR;
-  UBool match = matcher->find(0, status);
-  DCHECK(U_SUCCESS(status));
-  return match == TRUE;
-}
-
-}  // namespace autofill