Format WORKSPACE and BUILD files with buildifier version 0.12.0

Change-Id: I6d5d4f34ba2317b82547f5dde5d0ef69d69cfce7

Documentation/dev-contributing.txt

@@ -155,7 +155,7 @@ To format Java source code, Gerrit uses the
 link:https://github.com/google/google-java-format[`google-java-format`]
 tool (version 1.5), and to format Bazel BUILD and WORKSPACE files the
 link:https://github.com/bazelbuild/buildtools/tree/master/buildifier[`buildifier`]
-tool (version 0.11.1).
+tool (version 0.12.0).
 These tools automatically apply format according to the style guides; this
 streamlines code review by reducing the need for time-consuming, tedious,
 and contentious discussions about trivial issues like whitespace.

WORKSPACE

@@ -1,7 +1,7 @@
 workspace(name = "gerrit")
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive", "http_file")
-load("//tools/bzl:maven_jar.bzl", "maven_jar", "GERRIT", "MAVEN_LOCAL")
+load("//tools/bzl:maven_jar.bzl", "GERRIT", "MAVEN_LOCAL", "maven_jar")
 load("//lib/codemirror:cm.bzl", "CM_VERSION", "DIFF_MATCH_PATCH_VERSION")
 load("//plugins:external_plugin_deps.bzl", "external_plugin_deps")
 
@@ -218,7 +218,7 @@ maven_jar(
     sha1 = "675642ac208e0b741bc9118dcbcae44c271b992a",
 )
 
-load("//lib:guava.bzl", "GUAVA_VERSION", "GUAVA_BIN_SHA1")
+load("//lib:guava.bzl", "GUAVA_BIN_SHA1", "GUAVA_VERSION")
 
 maven_jar(
     name = "guava",
@@ -929,7 +929,7 @@ maven_jar(
     sha1 = "65bd0cacc9c79a21c6ed8e9f588577cd3c2f85b9",
 )
 
-load("//tools/bzl:js.bzl", "npm_binary", "bower_archive")
+load("//tools/bzl:js.bzl", "bower_archive", "npm_binary")
 
 npm_binary(
     name = "bower",

gerrit-gwtui/BUILD

@@ -1,7 +1,7 @@
 load(
     "//tools/bzl:gwt.bzl",
-    "gwt_genrule",
     "gen_ui_module",
+    "gwt_genrule",
     "gwt_user_agent_permutations",
 )
 load("//tools/bzl:license.bzl", "license_test")

polygerrit-ui/app/BUILD

@@ -3,13 +3,13 @@ package(
 )
 
 load("//tools/bzl:genrule2.bzl", "genrule2")
-load("@io_bazel_rules_closure//closure:defs.bzl", "closure_js_library", "closure_js_binary")
+load("@io_bazel_rules_closure//closure:defs.bzl", "closure_js_binary", "closure_js_library")
 load(
     "//tools/bzl:js.bzl",
-    "bower_component_bundle",
-    "vulcanize",
     "bower_component",
+    "bower_component_bundle",
     "js_component",
+    "vulcanize",
 )
 
 vulcanize(