Reformat all gn files in /services/audio.

`gn format` recently changed its formatting behavior
for deps, source, and a few other elements when they
are assigned (with =) single-element lists to be consistent
with the formatting of updates (with +=) with single-element.

Now that we've rolled in a GN binary with the change,
reformat all files so that people don't get presubmit
warnings due to this.

This CL was uploaded by git cl split.

R=miu@chromium.org

Bug: 1041419
Change-Id: Id32547ef130ab030f6562bdac1d836c863b8a4b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1997749
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731192}

services/audio/public/cpp/BUILD.gn

@@ -43,9 +43,7 @@ source_set("test_support") {
     "fake_system_info.h",
   ]
 
-  deps = [
-    "//testing/gmock",
-  ]
+  deps = [ "//testing/gmock" ]
 
   public_deps = [
     "//base",