Fix a browser crash when the async resource handler keeps an...

base/shared_memory.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef BASE_SHARED_MEMORY_H_
 #define BASE_SHARED_MEMORY_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_POSIX)
@@ skipping 95 matching lines @@
   // Returns true on success, false otherwise.
   bool ShareToProcess(base::ProcessHandle process,
                       SharedMemoryHandle* new_handle) {
     return ShareToProcessCommon(process, new_handle, false);
   }
 
   // Logically equivalent to:
   //   bool ok = ShareToProcess(process, new_handle);
   //   Close();
   //   return ok;
+  // Note that the memory is unmapped by calling this method, regardless of the
+  // return value.
   bool GiveToProcess(ProcessHandle process,
                      SharedMemoryHandle* new_handle) {
     return ShareToProcessCommon(process, new_handle, true);
   }
 
   // Lock the shared memory.
   // This is a cross-process lock which may be recursively
   // locked by the same thread.
   // TODO(port):
   // WARNING: on POSIX the lock only works across processes, not
@@ skipping 44 matching lines @@
   }
 
  private:
   SharedMemory* shared_memory_;
   DISALLOW_EVIL_CONSTRUCTORS(SharedMemoryAutoLock);
 };
 
 }  // namespace base
 
 #endif  // BASE_SHARED_MEMORY_H_