Align ashmem region sizes to page size after ashmem creation failed.

base/memory/discardable_memory_android.h

 // 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.
 
 // Please use discardable_memory.h since this is just an internal file providing
 // utility functions used both by discardable_memory_android.cc and
 // discardable_memory_allocator_android.cc.
 
 #ifndef BASE_MEMORY_DISCARDABLE_MEMORY_ANDROID_H_
 #define BASE_MEMORY_DISCARDABLE_MEMORY_ANDROID_H_
 
 #include "base/basictypes.h"
 #include "base/memory/discardable_memory.h"
 
 namespace base {
 namespace internal {
 
-// Returns 0 if the provided size is too high to be aligned.
-size_t AlignToNextPage(size_t size);
-
 bool CreateAshmemRegion(const char* name, size_t size, int* fd, void** address);
 
 bool CloseAshmemRegion(int fd, size_t size, void* address);
 
 DiscardableMemoryLockStatus LockAshmemRegion(int fd,
                                              size_t offset,
                                              size_t size,
                                              const void* address);
 
 bool UnlockAshmemRegion(int fd,
                         size_t offset,
                         size_t size,
                         const void* address);
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_MEMORY_DISCARDABLE_MEMORY_ANDROID_H_