Fix PluginImageData and mouselock NaCl example:

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_image_data.cc

 // Copyright 2011 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 "native_client/src/shared/ppapi_proxy/plugin_ppb_image_data.h"
 
 #include <stdio.h>
 #include <string.h>
 #include <sys/mman.h>
 #include "srpcgen/ppb_rpc.h"
@@ skipping 122 matching lines @@
     &DoUnmap,
   };
   return &image_data_interface;
 }
 
 PluginImageData::PluginImageData()
     : shm_size_(0),
       addr_(NULL) {
 }
 
+PluginImageData::~PluginImageData() {
+  Unmap();
+}
+
 bool PluginImageData::InitFromBrowserResource(PP_Resource resource) {
   nacl_abi_size_t desc_size = static_cast<nacl_abi_size_t>(sizeof(desc_));
   int32_t success = PP_FALSE;
 
   NaClSrpcError result =
       PpbImageDataRpcClient::PPB_ImageData_Describe(
           GetMainSrpcChannel(),
           resource,
           &desc_size,
           reinterpret_cast<char*>(&desc_),
@@ skipping 17 matching lines @@
 }
 
 void PluginImageData::Unmap() {
   if (addr_) {
     munmap(addr_, ceil64k(shm_size_));
     addr_ = NULL;
   }
 }
 
 }  // namespace ppapi_proxy