Apply gn format with 'sources' sorting to src/

Application of https://codereview.chromium.org/962003002/.

TBR=keybuk@chromium.org
R=brettw@chromium.org
BUG=456014

Review URL: https://codereview.chromium.org/960413003

Cr-Original-Commit-Position: refs/heads/master@{#318574}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7c7296f4dcb7e32fa4440b333a40a37699f517b1
diff --git a/generate_library_loader.gni b/generate_library_loader.gni
index 2b6874a..24f753b 100644
--- a/generate_library_loader.gni
+++ b/generate_library_loader.gni
@@ -60,8 +60,8 @@
       public_configs = [ invoker.config ]
     }
     sources = [
-      output_h,
       output_cc,
+      output_h,
     ]
     deps = [
       ":${target_name}_loader",