Improves GN's make_global_settings

build/toolchain/clang.gni

Index: build/toolchain/clang.gni
diff --git a/build/toolchain/clang.gni b/build/toolchain/clang.gni
index d45ea0618a752cff1ecbb52db1a2153397a82925..433ab3227d4caadc4870bf1b36dfa6a75c6b2925 100644
--- a/build/toolchain/clang.gni
+++ b/build/toolchain/clang.gni
@@ -25,11 +25,10 @@ if (is_clang) {
     make_clang_dir = "third_party/llvm-build/Release+Asserts"
   }
 
+  # This includes the array values but not the 'make_global_settings' name.
   make_clang_global_settings =
-    "'make_global_settings': [" +
     "['CC', '$make_clang_dir/bin/clang']," +
     "['CXX', '$make_clang_dir/bin/clang++']," +
     "['CC.host', '\$(CC)']," +
-    "['CXX.host', '\$(CXX)']," +
-    "],"
+    "['CXX.host', '\$(CXX)'],"
 }