Don't define USE_HEAPCHECKER on Windows.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/3815007

git-svn-id: http://src.chromium.org/svn/trunk/src/build@62780 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

build_config.h

@@ -66,7 +66,7 @@
 #endif
 
 // Use heapchecker.
-#if (defined(OS_WIN) || defined(OS_LINUX)) && !defined(NO_HEAPCHECKER)
+#if defined(OS_LINUX) && !defined(NO_HEAPCHECKER)
 #define USE_HEAPCHECKER 1
 #endif