[Android] Update existing uses of now-deprecated --test-arguments.

testing/buildbot/filters/README.md

 # Test filter files
 
 ## Summary
 
 This directory contains files that list tests that are not yet ready to run in a
 particular mode. For example - the `site-per-process.browser_tests.filter` file
 lists tests that should be excluded when running `browser_tests` in
 `--site-per-process` mode.
 
 ## File syntax
@@ skipping 40 matching lines @@
 $ out/dbg/content_browsertests \
     --site-per-process \
     --test-launcher-filter-file=testing/buildbot/filters/site-per-process.content_browsertests.filter
 ```
 
 When running tests on Android, the test filter file can be specified using
 `--gtest-filter-file` command line flag. Example test invocation:
 
 ```bash
 $ out/android/bin/run_content_browsertests \
-    --test-arguments=--site-per-process \
+    --site-per-process \
     --gtest-filter-file=testing/buildbot/filters/site-per-process.content_browsertests.filter
 ```
 
 ## Applicability
 
 Test filter files described here are currently only supported for gtest-based
 tests.
 
 For excluding layout tests when running with a particular command line flag, see
 `third_party/WebKit/LayoutTests/FlagExpectations/README.txt`.
 
 ## Adding new test filter files
 
 Please use the following conventions when naming the new file:
 
 -   Please include the name of the test executable (e.g.
     `content_browsertests`).
 -   Please use `.filter` suffix.
 -   Feel free to add other relevant things into the file name (e.g. the mode the
     file applies to - for example `site-per-process`).
 
 When adding a new file, please update `//testing/buildbot/filters/BUILD.gn`.
 
 [gtest_filter]: https://github.com/google/googletest/blob/master/googletest/docs/AdvancedGuide.md#running-a-subset-of-the-tests