Revert of Un-nest configs in GN files.

third_party/lzma_sdk/BUILD.gn

Index: third_party/lzma_sdk/BUILD.gn
diff --git a/third_party/lzma_sdk/BUILD.gn b/third_party/lzma_sdk/BUILD.gn
index 74fff2dc2bc4df12065e2d1b940c6ccb02e97114..2afe7b4f7e307c1c0d82c0591a748184a16f4f17 100644
--- a/third_party/lzma_sdk/BUILD.gn
+++ b/third_party/lzma_sdk/BUILD.gn
@@ -4,15 +4,6 @@
 
 config("lzma_sdk_config") {
   include_dirs = [ "." ]
-}
-
-# Must be in a config because of how GN orders flags (otherwise -Wall will
-# appear after this, and turn it back on).
-config("clang_warnings") {
-  if (is_clang) {
-    # Upstream uses self-assignment to avoid warnings.
-    cflags = [ "-Wno-self-assign" ]
-  }
 }
 
 static_library("lzma_sdk") {
@@ -59,9 +50,17 @@
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
-  configs += [
-    ":clang_warnings",
-    "//build/config/compiler:no_chromium_code",
-  ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+
   public_configs = [ ":lzma_sdk_config" ]
+
+  # Must be in a config because of how GN orders flags (otherwise -Wall will
+  # appear after this, and turn it back on).
+  config("clang_warnings") {
+    if (is_clang) {
+      # Upstream uses self-assignment to avoid warnings.
+      cflags = [ "-Wno-self-assign" ]
+    }
+  }
+  configs += [ ":clang_warnings" ]
 }