diff -Naur chromium-52.0.2743.76/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp chromium-52.0.2743.76b/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp
--- chromium-52.0.2743.76/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp	2016-07-15 17:02:49.000000000 -0500
+++ chromium-52.0.2743.76b/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp	2016-11-18 09:13:01.109731385 -0600
@@ -41,6 +41,11 @@
 #include <errno.h>
 #include <sys/mman.h>
 
+#if OS(LINUX) && defined(MADV_FREE)
+// Added in Linux 4.5, but it breaks the sandbox.
+#undef MADV_FREE
+#endif
+
 #ifndef MADV_FREE
 #define MADV_FREE MADV_DONTNEED
 #endif