Remove -fstack-protector-strong from the ChromeOS GN build.

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 3d03b4b4e27d0a93b521e3a4b994d92f0c78fa78..4537bff3efe333e871a55b88af944c9fc91aed13 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -32,11 +32,8 @@ config("compiler") {
     ]
 
     # Stack protection.
-    # TODO(brettw) why do we have different values for all of these cases?
     if (is_mac) {
       cflags += "-fstack-protector-all"
-    } else if (is_chromeos) {
-      cflags += "-fstack-protector-strong"
     } else if (is_linux) {
       cflags += [ "-fstack-protector", "--param=ssp-buffer-size=4" ]
     }