[Autofill] Fill from the last digits when filling a phone number with a maximum length.

components/autofill/core/browser/autofill_field.h

 // 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.
 
 #ifndef COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_FIELD_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_FIELD_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 71 matching lines @@
   // and |app_locale| as hints when filling exceptional cases like phone number
   // values and <select> fields. Returns |true| if the field has been filled,
   // |false| otherwise.
   static bool FillFormField(const AutofillField& field,
                             const base::string16& value,
                             const std::string& address_language_code,
                             const std::string& app_locale,
                             FormFieldData* field_data);
 
   // Returns the phone number value for the given |field|. The returned value
-  // might be |number|, or could possibly be a prefix or suffix of |number|
-  // if that's appropriate for the field.
+  // might be |number|, or could possibly be a meaningful subset |number|, if
+  // that's appropriate for the field.
   static base::string16 GetPhoneNumberValue(const AutofillField& field,
                                             const base::string16& number,
                                             const FormFieldData& field_data);
 
   // Returns true if the select |field| contains an option that matches |value|.
   // If the return value is true and |index| is non-NULL, write the index of the
   // matching option into |index|.
   static bool FindValueInSelectControl(const FormFieldData& field,
                                        const base::string16& value,
                                        size_t* index);
@@ skipping 34 matching lines @@
 
   // Whether the field was autofilled then later edited.
   bool previously_autofilled_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillField);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_FIELD_H_