android: Convert java_deobfuscate.py to Java

This allows it to not buffer output lines, which is essential when
piping logcat through it.

BUG=713710

Review-Url: https://codereview.chromium.org/2956153003
Cr-Commit-Position: refs/heads/master@{#484281}
diff --git a/BUILD.gn b/BUILD.gn
index b1fd306..04dde8d 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -273,6 +273,7 @@
       "//base/android/linker:chromium_android_linker",
       "//build/android/gyp/test:hello_world",
       "//build/android/gyp/test:hello_world",
+      "//build/android/stacktrace:java_deobfuscate",
       "//chrome/android/webapk/shell_apk:webapk",
       "//chrome/test/vr/perf:motopho_latency_test",
       "//components/invalidation/impl:components_invalidation_impl_junit_tests",