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I am getting the following gn gen errors when I have the following gn
args in a clank repo. This CL fixes those unused gn variables to
suppress those errors.

Almost all of the changes are suggested by torne@chromium.org.

gn args:

target_os = "android"
target_cpu = "arm64"
dcheck_always_on = true
is_debug = true
is_java_debug = true
enable_proguard_obfuscation = false
is_component_build = false
symbol_level = 1
use_jumbo_build = false
build_apk_secondary_abi = false

gn error:

ERROR at //chrome/android/BUILD.gn:1553:29: Assignment had no effect.
  native_lib_version_rule = "//build/util:chrome_version_json"
                            ^---------------------------------
You set the variable "native_lib_version_rule" here and it was unused before it went
out of scope.
See //chrome/android/BUILD.gn:1530:1: whence it was called.
android_apk("trichrome_library_apk") {
^-------------------------------------
See //BUILD.gn:339:9: which caused the file to be included.
        "//chrome/android:chrome_junit_tests",
        ^------------------------------------

Bug: 887078
Change-Id: I6c2a7aaef437fde9e6c52311d086e11b1f86574c
Reviewed-on: https://chromium-review.googlesource.com/c/1284091Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600179}