[Android] Remove --test-arguments arg from test_runner.py.

docs/android_debugging_instructions.md

 # Android Debugging Instructions
 
 Chrome on Android has java and c/c++ code. Each "side" have its own set of tools
 for debugging. Here's some tips.
 
 [TOC]
 
 ## Setting up command line flags
 
 Various commands below requires setting up command line flags.
@@ skipping 219 matching lines @@
 ```
 
 In the source itself, use `fprintf(stderr, "message");` whenever you need to
 output a message.
 
 ## Debug unit tests with GDB
 
 To run unit tests use the following command:
 
 ```shell
-out/Debug/bin/run_test_name -f <test_filter_if_any> --test-arguments=--wait-for-debugger -t 6000
+out/Debug/bin/run_test_name -f <test_filter_if_any> --wait-for-debugger -t 6000
 ```
 
 That command will cause the test process to wait until a debugger is attached.
 
 To attach a debugger:
 
 ```shell
 build/android/adb_gdb --output-directory=out/Default --package-name=org.chromium.native_test
 ```
 
 After attaching gdb to the process you can use it normally. For example:
 
 ```
 (gdb) break main
 Breakpoint 1 at 0x9750793c: main. (2 locations)
 (gdb) continue
 ```