Reformat all gn files in /ios/chrome/browser/ui/main.

`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=edchin@chromium.org

Bug: 1041419
Change-Id: I9a1edf49df78480bf90f2eec8578f150a9bd21bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1997658
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732005}

ios/chrome/browser/ui/main/test/BUILD.gn

@@ -10,7 +10,5 @@ source_set("test") {
     "stub_browser_interface_provider.h",
     "stub_browser_interface_provider.mm",
   ]
-  deps = [
-    "//ios/chrome/browser/ui/main",
-  ]
+  deps = [ "//ios/chrome/browser/ui/main" ]
 }