diff -up chromium-63.0.3239.84/build/toolchain/linux/BUILD.gn.nullfix chromium-63.0.3239.84/build/toolchain/linux/BUILD.gn
--- chromium-63.0.3239.84/build/toolchain/linux/BUILD.gn.nullfix	2017-12-06 15:05:21.000000000 -0500
+++ chromium-63.0.3239.84/build/toolchain/linux/BUILD.gn	2017-12-07 10:44:34.507207080 -0500
@@ -31,6 +31,7 @@ gcc_toolchain("arm64") {
   ld = cxx
   readelf = "${toolprefix}readelf"
   nm = "${toolprefix}nm"
+  extra_cppflags = "-fno-delete-null-pointer-checks"
 
   toolchain_args = {
     current_cpu = "arm64"
@@ -49,6 +50,7 @@ gcc_toolchain("arm") {
   ld = cxx
   readelf = "${toolprefix}readelf"
   nm = "${toolprefix}nm"
+  extra_cppflags = "-fno-delete-null-pointer-checks"
 
   toolchain_args = {
     current_cpu = "arm"
@@ -99,6 +101,7 @@ gcc_toolchain("x86") {
   nm = "nm"
   ar = "ar"
   ld = cxx
+  extra_cppflags = "-fno-delete-null-pointer-checks"
 
   # Output linker map files for binary size analysis.
   enable_linker_map = true
@@ -152,6 +155,7 @@ gcc_toolchain("x64") {
   nm = "nm"
   ar = "ar"
   ld = cxx
+  extra_cppflags = "-fno-delete-null-pointer-checks"
 
   # Output linker map files for binary size analysis.
   enable_linker_map = true
@@ -186,6 +190,7 @@ gcc_toolchain("mipsel") {
   ld = cxx
   readelf = "${toolprefix}readelf"
   nm = "${toolprefix}nm"
+  extra_cppflags = "-fno-delete-null-pointer-checks"
 
   toolchain_args = {
     cc_wrapper = ""