[Autofill] Guard against the initialization failure of ICU Collator.

components/autofill/core/common/autofill_l10n_util.h

 // Copyright 2015 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 "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
+#include "third_party/icu/source/common/unicode/locid.h"
 #include "third_party/icu/source/i18n/unicode/coll.h"
 
 namespace autofill {
 namespace l10n {
 
 // Assists with locale-aware case insensitive string comparisons.
 class CaseInsensitiveCompare {
  public:
   CaseInsensitiveCompare();
+  // Used for testing.
+  explicit CaseInsensitiveCompare(const icu::Locale& locale);
   ~CaseInsensitiveCompare();
 
   bool StringsEqual(const base::string16& lhs, const base::string16& rhs) const;
 
  private:
   scoped_ptr<icu::Collator> collator_;
 
   DISALLOW_COPY_AND_ASSIGN(CaseInsensitiveCompare);
 };
 
 }  // namespace l10n
 }  // namespace autofill