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

base/memory/discardable_memory_android.h

Index: base/memory/discardable_memory_android.h
diff --git a/base/memory/discardable_memory_android.h b/base/memory/discardable_memory_android.h
index 07c2e378ee1670030118e27d1894a141e941ed80..28b256df1505b168745f92c3ad49b6dd8267a23c 100644
--- a/base/memory/discardable_memory_android.h
+++ b/base/memory/discardable_memory_android.h
@@ -15,9 +15,6 @@
 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);