FBTF: Fix more ctor/dtors found by clang plugin.

gpu/command_buffer/client/mapped_memory.cc

 // Copyright (c) 2009 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 <algorithm>
 #include <functional>
 
 #include "../client/mapped_memory.h"
 #include "../client/cmd_buffer_helper.h"
 
 namespace gpu {
 namespace {
 void DeleteMemoryChunk(MemoryChunk* chunk) {
   delete chunk;
 }
 }
 
 MemoryChunk::MemoryChunk(
     int32 shm_id, gpu::Buffer shm, CommandBufferHelper* helper)
     : shm_id_(shm_id),
       shm_(shm),
       allocator_(shm.size, helper, shm.ptr) {
 }
 
+MappedMemoryManager::MappedMemoryManager(CommandBufferHelper* helper)
+    : helper_(helper) {
+}
+
 MappedMemoryManager::~MappedMemoryManager() {
   std::for_each(chunks_.begin(),
                 chunks_.end(),
                 std::pointer_to_unary_function<MemoryChunk*, void>(
                     DeleteMemoryChunk));
 }
 
 void* MappedMemoryManager::Alloc(
     unsigned int size, int32* shm_id, unsigned int* shm_offset) {
   GPU_DCHECK(shm_id);
@@ skipping 46 matching lines @@
       return;
     }
   }
   GPU_NOTREACHED();
 }
 
 }  // namespace gpu