Disallow NaCl in chrome webstore for ARM

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 168a585aa14394aa6a8224d3795d4567f92bebda..a14a849b155c62895f7b7465e3fc77693d4a7dd5 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -606,10 +606,15 @@ bool ChromeContentRendererClient::IsNaClAllowed(
   // under development, invocations from whitelisted URLs, and all invocations
   // if --enable-nacl is set.
   bool is_nacl_allowed =
-      is_extension_from_webstore ||
-      is_extension_unrestricted ||
-      is_whitelisted_url ||
-      is_nacl_unrestricted;
+#if !defined(__arm__)
+    // The ARM ABI is not quite stable, so only allow NaCl for
+    // unrestricted extensions (i.e. built-in and under development).
+    // TODO(dschuff): remove this when the ABI is stable
+    is_extension_from_webstore ||
+    is_whitelisted_url ||
+#endif
+    is_extension_unrestricted ||
+    is_nacl_unrestricted;
   if (is_nacl_allowed) {
     bool app_can_use_dev_interfaces =
         // NaCl PDF viewer extension