Move goma/ccache logic to //build/toolchain/gcc_toolchain.gni

build/toolchain/nacl_toolchain.gni

Index: build/toolchain/nacl_toolchain.gni
diff --git a/build/toolchain/nacl_toolchain.gni b/build/toolchain/nacl_toolchain.gni
index 15ae604cb12c8a84e1be540e365c0fbb7d21417d..76004889296ca14f2febc360197bac7c0fa32a42 100644
--- a/build/toolchain/nacl_toolchain.gni
+++ b/build/toolchain/nacl_toolchain.gni
@@ -49,6 +49,8 @@ template("nacl_toolchain") {
     # We do not suport component builds or sanitizers with the NaCl toolchains.
     is_component_build = false
     clear_sanitizers = true
+    use_ccache = false
+    use_goma = false
 
     rebuild_define = "NACL_TC_REV=" + invoker.toolchain_revision
   }