Revert of Un-nest configs in GN files.

third_party/snappy/BUILD.gn

Index: third_party/snappy/BUILD.gn
diff --git a/third_party/snappy/BUILD.gn b/third_party/snappy/BUILD.gn
index 8ab472d371c696b74c50001ece68fde4dcdf448a..97cce89bc719d8425d88b54a724bb0d758027c81 100644
--- a/third_party/snappy/BUILD.gn
+++ b/third_party/snappy/BUILD.gn
@@ -16,14 +16,6 @@
   }
 }
 
-config("snappy_warnings") {
-  if (is_clang) {
-    # ComputeTable is unused,
-    # https://code.google.com/p/snappy/issues/detail?id=96
-    cflags = [ "-Wno-unused-function" ]
-  }
-}
-
 static_library("snappy") {
   sources = [
     "src/snappy-internal.h",
@@ -35,11 +27,16 @@
     "src/snappy.h",
   ]
 
+  config("snappy_warnings") {
+    if (is_clang) {
+      # ComputeTable is unused,
+      # https://code.google.com/p/snappy/issues/detail?id=96
+      cflags = [ "-Wno-unused-function" ]
+    }
+  }
   configs -= [ "//build/config/compiler:chromium_code" ]
-  configs += [
-    ":snappy_warnings",
-    "//build/config/compiler:no_chromium_code",
-  ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+  configs += [ ":snappy_warnings" ]
   public_configs = [ ":snappy_config" ]
 
   if (is_win) {