Coverity: Fix leaking TransportDIB in GpuBackingStore{GLX,Win}::OnPaintToBackingStore

chrome/gpu/gpu_backing_store_win.cc

 // Copyright (c) 2010 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 "chrome/gpu/gpu_backing_store_win.h"
 
 #include "app/win_util.h"
 #include "base/logging.h"
 #include "chrome/common/gpu_messages.h"
 #include "chrome/gpu/gpu_view_win.h"
@@ skipping 112 matching lines @@
   HANDLE source_process_handle = OpenProcess(PROCESS_ALL_ACCESS,
                                              FALSE, source_process_id);
   CHECK(source_process_handle);
 
   // On Windows we need to duplicate the handle from the remote process.
   // See BrowserRenderProcessHost::MapTransportDIB for how to do this on other
   // platforms.
   HANDLE section = win_util::GetSectionFromProcess(
       id.handle, source_process_handle, false /* read write */);
   CHECK(section);
-  TransportDIB* dib = TransportDIB::Map(section);
-  CHECK(dib);
+  scoped_ptr<TransportDIB> dib(TransportDIB::Map(section));
+  CHECK(dib.get());
 
   if (!backing_store_dib_) {
     backing_store_dib_ = CreateDIB(hdc_, size_.width(),
                                    size_.height(), color_depth_);
     if (!backing_store_dib_) {
       NOTREACHED();
 
       // TODO(brettw): do this in such a way that we can't forget to
       // send the ACK.
       gpu_thread_->Send(new GpuHostMsg_PaintToBackingStore_ACK(routing_id_));
@@ skipping 31 matching lines @@
                                               const gfx::Rect& clip_rect,
                                               const gfx::Size& view_size) {
   RECT damaged_rect, r = clip_rect.ToRECT();
   ScrollDC(hdc_, dx, dy, NULL, &r, NULL, &damaged_rect);
 
   // TODO(darin): this doesn't work if dx and dy are both non-zero!
   DCHECK(dx == 0 || dy == 0);
 
   view_->DidScrollBackingStoreRect(dx, dy, clip_rect);
 }