Removed old SDCH ProblemCode constants that are no longer being used in UMA.

net/base/sdch_problem_code_list.h

 // Copyright 2014 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.
 
 // This file intentionally does not have header guards, it's included
 // inside a macro to generate enum values.
 
 // This file contains list of sdch-related problem codes.
 // No error.
 SDCH_PROBLEM_CODE(OK, 0)
@@ skipping 15 matching lines @@
 SDCH_PROBLEM_CODE(BINARY_FIXED_CONTENT_ENCODING, 8)
 SDCH_PROBLEM_CODE(BINARY_FIXED_CONTENT_ENCODINGS, 9)
 
 // Dictionary selection for use problems.
 SDCH_PROBLEM_CODE(DICTIONARY_FOUND_HAS_WRONG_DOMAIN, 10)
 SDCH_PROBLEM_CODE(DICTIONARY_FOUND_HAS_WRONG_PORT_LIST, 11)
 SDCH_PROBLEM_CODE(DICTIONARY_FOUND_HAS_WRONG_PATH, 12)
 SDCH_PROBLEM_CODE(DICTIONARY_FOUND_HAS_WRONG_SCHEME, 13)
 SDCH_PROBLEM_CODE(DICTIONARY_HASH_NOT_FOUND, 14)
 SDCH_PROBLEM_CODE(DICTIONARY_HASH_MALFORMED, 15)
-SDCH_PROBLEM_CODE(DICTIONARY_FOUND_EXPIRED, 16)
+// defunct = 16, no longer used
 
 // Dictionary saving problems.
 SDCH_PROBLEM_CODE(DICTIONARY_HAS_NO_HEADER, 20)
 SDCH_PROBLEM_CODE(DICTIONARY_HEADER_LINE_MISSING_COLON, 21)
 SDCH_PROBLEM_CODE(DICTIONARY_MISSING_DOMAIN_SPECIFIER, 22)
 SDCH_PROBLEM_CODE(DICTIONARY_SPECIFIES_TOP_LEVEL_DOMAIN, 23)
 SDCH_PROBLEM_CODE(DICTIONARY_DOMAIN_NOT_MATCHING_SOURCE_URL, 24)
 SDCH_PROBLEM_CODE(DICTIONARY_PORT_NOT_MATCHING_SOURCE_URL, 25)
 SDCH_PROBLEM_CODE(DICTIONARY_HAS_NO_TEXT, 26)
 SDCH_PROBLEM_CODE(DICTIONARY_REFERER_URL_HAS_DOT_IN_PREFIX, 27)
@@ skipping 78 matching lines @@
 // General SDCH problems.
 // SDCH is disabled.
 SDCH_PROBLEM_CODE(DISABLED, 105)
 // SDCH over https is disabled.
 SDCH_PROBLEM_CODE(SECURE_SCHEME_NOT_SUPPORTED, 106)
 
 // Used to bound histogram.
 SDCH_PROBLEM_CODE(MAX_PROBLEM_CODE, 110)
 
 // These values are not used in histograms.