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

testing/buildbot/chromium.fyi.json

Index: testing/buildbot/chromium.fyi.json
diff --git a/testing/buildbot/chromium.fyi.json b/testing/buildbot/chromium.fyi.json
index f003e18dbbfd255656a83d7859f750a2263fad3b..cfaaab3a0681f19f9f170c90e75e572ad5093d4c 100644
--- a/testing/buildbot/chromium.fyi.json
+++ b/testing/buildbot/chromium.fyi.json
@@ -11888,7 +11888,7 @@
       {
         "args": [
           "--gtest-filter-file=../../testing/buildbot/filters/site-per-process.content_browsertests.filter",
-          "--test-arguments=--site-per-process"
+          "--site-per-process"
         ],
         "name": "site_per_process_content_browsertests",
         "override_isolate_target": "content_browsertests",
@@ -11919,7 +11919,7 @@
       },
       {
         "args": [
-          "--test-arguments=--site-per-process"
+          "--site-per-process"
         ],
         "name": "site_per_process_content_unittests",
         "override_isolate_target": "content_unittests",
@@ -11936,7 +11936,7 @@
       },
       {
         "args": [
-          "--test-arguments=--site-per-process"
+          "--site-per-process"
         ],
         "name": "site_per_process_components_browsertests",
         "override_isolate_target": "components_browsertests",
@@ -11953,7 +11953,7 @@
       },
       {
         "args": [
-          "--test-arguments=--site-per-process"
+          "--site-per-process"
         ],
         "name": "site_per_process_components_unittests",
         "override_isolate_target": "components_unittests",