android: Convert java_deobfuscate.py to Java

build/android/stacktrace/BUILD.gn

+# Copyright 2017 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")
+
+java_binary("java_deobfuscate") {
+  main_class = "org.chromium.build.FlushingReTrace"
+  java_files = [ "java/org/chromium/build/FlushingReTrace.java" ]
+  deps = [
+    "//third_party/proguard:retrace_java",
+  ]
+  data = [
+    "$root_build_dir/lib.java/build/android/stacktrace/java_deobfuscate.jar",
+    "$root_build_dir/bin/java_deobfuscate",
+  ]
+}