Improve GCM enum switch type safety

google_apis/gcm/engine/connection_handler_impl.cc

 // 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.
 
 #include "google_apis/gcm/engine/connection_handler_impl.h"
 
 #include <utility>
 
 #include "base/location.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 211 matching lines @@
         min_bytes_needed = message_size_;
         max_bytes_needed = message_size_;
       } else {
         int bytes_left = message_size_ - payload_input_buffer_.size();
         if (bytes_left > kDefaultDataPacketLimit)
           bytes_left = kDefaultDataPacketLimit;
         min_bytes_needed = bytes_left;
         max_bytes_needed = bytes_left;
       }
       break;
-    default:
-      NOTREACHED();
   }
   DCHECK_GE(max_bytes_needed, min_bytes_needed);
 
   int unread_byte_count = input_stream_->UnreadByteCount();
   if (min_bytes_needed > unread_byte_count &&
       input_stream_->Refresh(
           base::Bind(&ConnectionHandlerImpl::WaitForData,
                      weak_ptr_factory_.GetWeakPtr(),
                      state),
           max_bytes_needed - unread_byte_count) == net::ERR_IO_PENDING) {
@@ skipping 34 matching lines @@
       break;
     case MCS_TAG_AND_SIZE:
       OnGotMessageTag();
       break;
     case MCS_SIZE:
       OnGotMessageSize();
       break;
     case MCS_PROTO_BYTES:
       OnGotMessageBytes();
       break;
-    default:
-      NOTREACHED();
   }
 }
 
 void ConnectionHandlerImpl::OnGotVersion() {
   uint8_t version = 0;
   {
     CodedInputStream coded_input_stream(input_stream_.get());
     coded_input_stream.ReadRaw(&version, 1);
   }
   // TODO(zea): remove this when the server is ready.
@@ skipping 191 matching lines @@
   message_tag_ = 0;
   message_size_ = 0;
   size_packet_so_far_ = 0;
   payload_input_buffer_.clear();
   input_stream_.reset();
   output_stream_.reset();
   weak_ptr_factory_.InvalidateWeakPtrs();
 }
 
 }  // namespace gcm