Reformat all gn files in /build/fuchsia.

`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=sergeyu@chromium.org

Bug: 1041419
Change-Id: I75346d1b1f7232a79fc0b335102f05bbd943ebe0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1998634
Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732449}

build/fuchsia/fidlgen_js/BUILD.gn

@@ -8,9 +8,7 @@ import("//testing/test.gni")
 test("fidlgen_js_unittests") {
   testonly = true
 
-  sources = [
-    "test/fidlgen_js_unittest.cc",
-  ]
+  sources = [ "test/fidlgen_js_unittest.cc" ]
 
   deps = [
     ":fidljstest",
@@ -26,13 +24,9 @@ test("fidlgen_js_unittests") {
     "//v8:external_startup_data",
   ]
 
-  data_deps = [
-    "//tools/v8_context_snapshot:v8_context_snapshot",
-  ]
+  data_deps = [ "//tools/v8_context_snapshot:v8_context_snapshot" ]
 
-  data = [
-    "runtime/fidl.mjs",
-  ]
+  data = [ "runtime/fidl.mjs" ]
 }
 
 static_library("runtime") {
@@ -52,9 +46,7 @@ static_library("runtime") {
 
 fidl_library("fidljstest") {
   testonly = true
-  sources = [
-    "test/simple.fidl",
-  ]
+  sources = [ "test/simple.fidl" ]
 
   languages = [
     "cpp",