allocator: Fix function type mismatch in allocator function definitions.

base/allocator/allocator_shim_override_libc_symbols.h

 // Copyright 2016 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.
 
-// Its purpose is to SHIM_ALIAS_SYMBOL the Libc symbols for malloc/new to the
+// Its purpose is to preempt the Libc symbols for malloc/new so they call the
 // shim layer entry points.
 
 #ifdef BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_LIBC_SYMBOLS_H_
 #error This header is meant to be included only once by allocator_shim.cc
 #endif
 #define BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_LIBC_SYMBOLS_H_
 
 #include <malloc.h>
 
 #include "base/allocator/allocator_shim_internals.h"
 
 extern "C" {
 
-SHIM_ALWAYS_EXPORT void* malloc(size_t size) __THROW
-    SHIM_ALIAS_SYMBOL(ShimMalloc);
+SHIM_ALWAYS_EXPORT void* malloc(size_t size) __THROW {
+  return ShimMalloc(size, nullptr);
+}
 
-SHIM_ALWAYS_EXPORT void free(void* ptr) __THROW
-    SHIM_ALIAS_SYMBOL(ShimFree);
+SHIM_ALWAYS_EXPORT void free(void* ptr) __THROW {
+  ShimFree(ptr, nullptr);
+}
 
-SHIM_ALWAYS_EXPORT void* realloc(void* ptr, size_t size) __THROW
-    SHIM_ALIAS_SYMBOL(ShimRealloc);
+SHIM_ALWAYS_EXPORT void* realloc(void* ptr, size_t size) __THROW {
+  return ShimRealloc(ptr, size, nullptr);
+}
 
-SHIM_ALWAYS_EXPORT void* calloc(size_t n, size_t size) __THROW
-    SHIM_ALIAS_SYMBOL(ShimCalloc);
+SHIM_ALWAYS_EXPORT void* calloc(size_t n, size_t size) __THROW {
+  return ShimCalloc(n, size, nullptr);
+}
 
-SHIM_ALWAYS_EXPORT void cfree(void* ptr) __THROW
-    SHIM_ALIAS_SYMBOL(ShimFree);
+SHIM_ALWAYS_EXPORT void cfree(void* ptr) __THROW {
+  ShimFree(ptr, nullptr);
+}
 
-SHIM_ALWAYS_EXPORT void* memalign(size_t align, size_t s) __THROW
-    SHIM_ALIAS_SYMBOL(ShimMemalign);
+SHIM_ALWAYS_EXPORT void* memalign(size_t align, size_t s) __THROW {
+  return ShimMemalign(align, s, nullptr);
+}
 
-SHIM_ALWAYS_EXPORT void* valloc(size_t size) __THROW
-    SHIM_ALIAS_SYMBOL(ShimValloc);
+SHIM_ALWAYS_EXPORT void* valloc(size_t size) __THROW {
+  return ShimValloc(size, nullptr);
+}
 
-SHIM_ALWAYS_EXPORT void* pvalloc(size_t size) __THROW
-    SHIM_ALIAS_SYMBOL(ShimPvalloc);
+SHIM_ALWAYS_EXPORT void* pvalloc(size_t size) __THROW {
+  return ShimPvalloc(size);
+}
 
-SHIM_ALWAYS_EXPORT int posix_memalign(void** r, size_t a, size_t s) __THROW
-    SHIM_ALIAS_SYMBOL(ShimPosixMemalign);
+SHIM_ALWAYS_EXPORT int posix_memalign(void** r, size_t a, size_t s) __THROW {
+  return ShimPosixMemalign(r, a, s);
+}
 
 // The default dispatch translation unit has to define also the following
 // symbols (unless they are ultimately routed to the system symbols):
 //   void malloc_stats(void);
 //   int mallopt(int, int);
 //   struct mallinfo mallinfo(void);
 //   size_t malloc_size(void*);
 //   size_t malloc_usable_size(const void*);
 
 }  // extern "C"