Revert of Allocator shims working on VS2015.

base/allocator/allocator_check.cc

Index: base/allocator/allocator_check.cc
diff --git a/base/allocator/allocator_check.cc b/base/allocator/allocator_check.cc
index 82a9067fc01f82195510bc925eb6d903d31f51b0..a708f0faf3cc1c60c14839f1dc3e44522a7f3120 100644
--- a/base/allocator/allocator_check.cc
+++ b/base/allocator/allocator_check.cc
@@ -6,10 +6,6 @@
 
 #include "build/build_config.h"
 
-#if defined(OS_WIN)
-#include "base/allocator/allocator_shim_win.h"
-#endif
-
 #if defined(OS_LINUX)
 #include <malloc.h>
 #endif
@@ -17,9 +13,15 @@
 namespace base {
 namespace allocator {
 
+// Defined in allocator_shim_win.cc .
+// TODO(primiano): replace with an include once base can depend on allocator.
+#if defined(OS_WIN) && defined(ALLOCATOR_SHIM)
+extern bool g_is_win_shim_layer_initialized;
+#endif
+
 bool IsAllocatorInitialized() {
 #if defined(OS_WIN) && defined(ALLOCATOR_SHIM)
-  // Set by allocator_shim_win.cc when the shimmed _set_new_mode() is called.
+  // Set by allocator_shim_win.cc when the shimmed _heap_init() is called.
   return g_is_win_shim_layer_initialized;
 #elif defined(OS_LINUX) && defined(USE_TCMALLOC)
 // From third_party/tcmalloc/chromium/src/gperftools/tcmalloc.h.