Reformat all gn files in /components/language_usage_metrics.

`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=toyoshim@chromium.org

Bug: 1041419
Change-Id: If270ddb77a27dfc85b07a11b185e3f7c1e00f305
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1997906
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731879}

components/language_usage_metrics/BUILD.gn

@@ -8,16 +8,12 @@ static_library("language_usage_metrics") {
     "language_usage_metrics.h",
   ]
 
-  deps = [
-    "//base",
-  ]
+  deps = [ "//base" ]
 }
 
 source_set("unit_tests") {
   testonly = true
-  sources = [
-    "language_usage_metrics_unittest.cc",
-  ]
+  sources = [ "language_usage_metrics_unittest.cc" ]
 
   deps = [
     ":language_usage_metrics",