Reformat all gn files in /chrome/android/webapk/shell_apk/mustache_pass.gni.

`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=pasko@chromium.org

Bug: 1041419
Change-Id: Ic155e6e0cac97155ca369d554b92ccc7b3af26f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1998158
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Egor Pasko <pasko@chromium.org>
Commit-Queue: Egor Pasko <pasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731680}

chrome/android/webapk/shell_apk/mustache_pass.gni

@@ -17,9 +17,7 @@ template("mustache_pass") {
                              "visibility",
                              "deps",
                            ])
-    sources = [
-      invoker.input,
-    ]
+    sources = [ invoker.input ]
     if (defined(invoker.config_file)) {
       sources += [ invoker.config_file ]
     }
@@ -29,9 +27,7 @@ template("mustache_pass") {
 
     script = "//chrome/android/webapk/shell_apk/mustache_pass.py"
 
-    outputs = [
-      invoker.output,
-    ]
+    outputs = [ invoker.output ]
 
     args = [
       "--template",