Small cleanups to perfetto_unittests.gni

- Move tracing_integration_test to perfetto_integrationtests.gni
- Move unittests for subdirs of src/traced/probes into the group target
- Move tool/sanitizers_unittests to test/sanitizers:unittests

Change-Id: I07bb84af0be3d209494be5a5c37b491826364737
diff --git a/gn/perfetto_unittests.gni b/gn/perfetto_unittests.gni
index dec85bc..52020a6 100644
--- a/gn/perfetto_unittests.gni
+++ b/gn/perfetto_unittests.gni
@@ -25,20 +25,13 @@
   "src/profiling/symbolizer:unittests",
 ]
 
-if (enable_perfetto_ipc) {
-  perfetto_unittests_targets += [ "src/tracing/test:tracing_integration_test" ]
-}
-
 if (enable_perfetto_tools && current_toolchain == host_toolchain) {
   perfetto_unittests_targets += [ "tools/ftrace_proto_gen:unittests" ]
 }
 
-# TODO(primiano): sanitizers_unittests shouldn't really be under tools. It's
-# not a tool and it's intended to run on both host and targets to check that
-# sanitizers are actually working.
 if ((is_linux || is_android) && !perfetto_build_with_embedder) {
   # This test depends on pthread and can't run on non-Linux-based OS.
-  perfetto_unittests_targets += [ "tools/sanitizers_unittests" ]
+  perfetto_unittests_targets += [ "test/sanitizers:unittests" ]
 }
 
 if (enable_perfetto_ipc) {
@@ -56,8 +49,6 @@
   if (enable_perfetto_traced_probes) {
     perfetto_unittests_targets += [
       "src/traced/probes:unittests",
-      "src/traced/probes/filesystem:unittests",
-      "src/traced/probes/ftrace:unittests",
       "src/kallsyms:unittests",
     ]
   }