[PoC] Reformat all BUILD.gn and *.gni files with new gn.

media/BUILD.gn

Index: media/BUILD.gn
diff --git a/media/BUILD.gn b/media/BUILD.gn
index 1e2589f527eb07764e099c3c8c227893f1c23c9e..c42a9bba2a4308350c1d68d7e50fa2bbcf99e38e 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -667,12 +667,12 @@ test("media_unittests") {
     ":test_support",
     "//base/allocator",
     "//base/test:test_support",
-    "//gpu/command_buffer/common",
     "//gpu:test_support",
-    "//media/audio:unittests",
+    "//gpu/command_buffer/common",
     "//media/audio:test_support",
-    "//media/base:unittests",
+    "//media/audio:unittests",
     "//media/base:test_support",
+    "//media/base:unittests",
     "//media/test:pipeline_integration_tests",
     "//skia",  # Direct dependency required to inherit config.
     "//testing/gmock",
@@ -891,8 +891,8 @@ if (media_use_ffmpeg) {
       "//testing/gmock",
       "//testing/gtest",
       "//third_party/ffmpeg",
-      "//ui/gfx/geometry",
       "//ui/gfx:test_support",
+      "//ui/gfx/geometry",
     ]
   }
 }