win/clang: Try to fix build after https://codereview.chromium.org/1243293003

chrome/browser/safe_browsing/incident_reporting/platform_state_store.cc

 // 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.
 
 // This file implements the platform-neutral Load() and Store() functions for a
 // profile's safebrowsing.incidents_sent preference dictionary. The preference
 // dict is converted to a protocol buffer message which is then serialized into
 // a byte array. This serialized data is written to or read from some
 // platform-specific storage via {Read,Write}StoreData implemented elsewhere.
 //
@@ skipping 131 matching lines @@
     case PlatformStateStoreLoadResult::CLEARED_NO_DATA:
       // Return a (possibly empty) dictionary for the success cases.
       break;
     case PlatformStateStoreLoadResult::DATA_CLEAR_FAILED:
     case PlatformStateStoreLoadResult::OPEN_FAILED:
     case PlatformStateStoreLoadResult::READ_FAILED:
     case PlatformStateStoreLoadResult::PARSE_ERROR:
       // Return null for all error cases.
       value_dict.reset();
       break;
+    case PlatformStateStoreLoadResult::NUM_RESULTS:
+      NOTREACHED();
+      break;
   }
   UMA_HISTOGRAM_ENUMERATION(
       "SBIRS.PSSLoadResult", static_cast<uint32_t>(result),
       static_cast<uint32_t>(PlatformStateStoreLoadResult::NUM_RESULTS));
   return value_dict.Pass();
 #else
   return scoped_ptr<base::DictionaryValue>();
 #endif
 }
 
@@ skipping 29 matching lines @@
     return PlatformStateStoreLoadResult::PARSE_ERROR;
   value_dict->Clear();
   RestoreFromProtobuf(store_data.type_to_incidents(), value_dict);
   return PlatformStateStoreLoadResult::SUCCESS;
 }
 
 #endif  // USE_PLATFORM_STATE_STORE
 
 }  // namespace platform_state_store
 }  // namespace safe_browsing