Suppress psabi warnings in 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 2d9564f3e1d1d47aa74c2a8fd8fa57da05c356e2..0ed4f4bfe453fc66669727e0c62a0916b79c0d44 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -603,6 +603,12 @@ config("default_warnings") {
       ]
     }
 
+    # Suppress warnings about ABI changes on ARM (Clang doesn't give this
+    # warning).
+    if (cpu_arch == "arm" && !is_clang) {
+      cflags += [ "-Wno-psabi" ]
+    }
+
     if (is_android) {
       # Disable any additional warnings enabled by the Android build system but
       # which chromium does not build cleanly with (when treating warning as