[PoC] Reformat all BUILD.gn and *.gni files with new gn.

components/precache/android/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/rules.gni")
 
 # GYP: //components/precache.gypi:precache_java
 android_library("precache_java") {
   deps = [
     "//base:base_java",
   ]
   DEPRECATED_java_in_dir = "java/src"
 }
 
 android_library("precache_javatests") {
   deps = [
+    ":precache_java",
     "//base:base_java_test_support",
-    ":precache_java",
   ]
   DEPRECATED_java_in_dir = "javatests/src"
 }