Reformat all gn files in /components/mirroring.

`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: Ibdcde4d07f7c038ab1559bdafd86a09d6d3a8574
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1995797
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731826}

components/mirroring/mojom/BUILD.gn

@@ -18,13 +18,9 @@ mojom("common") {
 }
 
 mojom("host") {
-  sources = [
-    "mirroring_service_host.mojom",
-  ]
+  sources = [ "mirroring_service_host.mojom" ]
 
-  public_deps = [
-    ":common",
-  ]
+  public_deps = [ ":common" ]
 }
 
 mojom("service") {

components/mirroring/service/BUILD.gn

@@ -38,9 +38,7 @@ component("mirroring_service") {
     "wifi_status_monitor.h",
   ]
 
-  public_deps = [
-    "//base",
-  ]
+  public_deps = [ "//base" ]
 
   deps = [
     "//components/mirroring/mojom:service",