Update from chromium https://crrev.com/302282

net/base/sdch_manager.cc

 // Copyright (c) 2012 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 "net/base/sdch_manager.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 33 matching lines @@
 // static
 const size_t SdchManager::kMaxDictionaryCount = 1;
 const size_t SdchManager::kMaxDictionarySize = 500 * 1000;
 #else
 // static
 const size_t SdchManager::kMaxDictionaryCount = 20;
 const size_t SdchManager::kMaxDictionarySize = 1000 * 1000;
 #endif
 
 // static
-bool SdchManager::g_sdch_enabled_ = true;
-
-// static
 #if defined(OS_IOS)
 // Workaround for http://crbug.com/418975; remove when fixed.
-bool SdchManager::g_secure_scheme_supported_ = false;
+bool SdchManager::g_sdch_enabled_ = false;
 #else
+bool SdchManager::g_sdch_enabled_ = true;
+#endif
+
+// static
 bool SdchManager::g_secure_scheme_supported_ = true;
-#endif
 
 //------------------------------------------------------------------------------
 SdchManager::Dictionary::Dictionary(const std::string& dictionary_text,
                                     size_t offset,
                                     const std::string& client_hash,
                                     const GURL& gurl,
                                     const std::string& domain,
                                     const std::string& path,
                                     const base::Time& expiration,
                                     const std::set<int>& ports)
@@ skipping 541 matching lines @@
 void SdchManager::UrlSafeBase64Encode(const std::string& input,
                                       std::string* output) {
   // Since this is only done during a dictionary load, and hashes are only 8
   // characters, we just do the simple fixup, rather than rewriting the encoder.
   base::Base64Encode(input, output);
   std::replace(output->begin(), output->end(), '+', '-');
   std::replace(output->begin(), output->end(), '/', '_');
 }
 
 }  // namespace net