Revert of Un-nest configs in GN files.

third_party/libxslt/BUILD.gn

Index: third_party/libxslt/BUILD.gn
diff --git a/third_party/libxslt/BUILD.gn b/third_party/libxslt/BUILD.gn
index 1ecb11cf2e2aeee4bcc6f27047788a2c777209e1..6b46db384f56dda1354718f69fa56b5b74767a87 100644
--- a/third_party/libxslt/BUILD.gn
+++ b/third_party/libxslt/BUILD.gn
@@ -5,19 +5,6 @@
 config("libxslt_config") {
   defines = [ "LIBXSLT_STATIC" ]
   include_dirs = [ "." ]
-}
-
-config("libxslt_warnings") {
-  if (is_clang) {
-    cflags = [
-      # libxslt stores a char[3] in a `const unsigned char*`.
-      "-Wno-pointer-sign",
-
-      # xsltDefaultRegion and xsltCalibrateTimestamps are only
-      # used with certain preprocessor defines set.
-      "-Wno-unused-function",
-    ]
-  }
 }
 
 static_library("libxslt") {
@@ -72,11 +59,21 @@
     "win32/config.h",
   ]
 
+  config("libxslt_warnings") {
+    if (is_clang) {
+      cflags = [
+        # libxslt stores a char[3] in a `const unsigned char*`.
+        "-Wno-pointer-sign",
+
+        # xsltDefaultRegion and xsltCalibrateTimestamps are only
+        # used with certain preprocessor defines set.
+        "-Wno-unused-function",
+      ]
+    }
+  }
   configs -= [ "//build/config/compiler:chromium_code" ]
-  configs += [
-    ":libxslt_warnings",
-    "//build/config/compiler:no_chromium_code",
-  ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+  configs += [ ":libxslt_warnings" ]
   public_configs = [ ":libxslt_config" ]
 
   cflags = []