android: Convert java_deobfuscate.py to Java

docs/android_debugging_instructions.md

Index: docs/android_debugging_instructions.md
diff --git a/docs/android_debugging_instructions.md b/docs/android_debugging_instructions.md
index fbb4f98041385e2be5954afa973e2f53166c9f75..3c4eba2abd9c5ec8d129d6da98600e93962cd117 100644
--- a/docs/android_debugging_instructions.md
+++ b/docs/android_debugging_instructions.md
@@ -203,19 +203,23 @@ that crashed was built. When building locally, these are found in:
 
 ```shell
 out/Default/apks/ChromePublic.apk.mapping
-out/Default/apks/Chrome.apk.mapping
+out/Default/apks/ChromeModernPublic.apk.mapping
+etc.
 ```
 
-To deobfuscate a stack trace from a file, run
+Build the `java_deobfuscate` tool:
 
 ```shell
-build/android/stacktrace/java_deobfuscate.py PROGUARD_MAPPING_FILE.mapping --stacktrace STACKTRACE_FILE
+ninja -C out/Default java_deobfuscate
 ```
 
-Deobfuscation also works from `stdin`:
+Then run it via:
 
 ```shell
-adb logcat -d | build/android/stacktrace/java_deobfuscate.py PROGUARD_MAPPING_FILE.mapping
+# For a file:
+out/Default/bin/java_deobfuscate PROGUARD_MAPPING_FILE.mapping < FILE
+# For logcat:
+adb logcat | out/Default/bin/java_deobfuscate PROGUARD_MAPPING_FILE.mapping
 ```
 
 ## Get WebKit code to output to the adb log