Switch to source-built GSON.

Bug: 243950468
Test: local build, presubmit, run test.
Change-Id: I8332a5b2c8e54ea504d54e41051abe3e7350f82c
diff --git a/performance_tests/hostside/Android.bp b/performance_tests/hostside/Android.bp
index d02805d..a864264 100644
--- a/performance_tests/hostside/Android.bp
+++ b/performance_tests/hostside/Android.bp
@@ -28,6 +28,6 @@
     static_libs: [
         "GameCoreHelperHost",
         "truth-prebuilt-host-jar",
-        "gson-prebuilt-jar",
+        "gson",
     ],
 }