memory-infra: Disable trace log after TracingObserverProtoTests

Not doing this may be causing flakes in other tracing tests later.

Bug: 1141233
Change-Id: I67f5ad3b746a06a23de055b34b7c3236105b1de8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2558791
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Commit-Queue: oysteine <oysteine@chromium.org>
Auto-Submit: Eric Seckler <eseckler@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830683}

services/resource_coordinator/public/cpp/memory_instrumentation/tracing_observer_proto_unittest.cc

@@ -43,7 +43,10 @@ class TracingObserverProtoTest : public testing::Test {
         std::make_unique<TestProducerClient>(std::move(perfetto_wrapper));
   }
 
-  void TearDown() override { producer_client_.reset(); }
+  void TearDown() override {
+    producer_client_.reset();
+    DisableTraceLog();
+  }
 
   TestProducerClient* GetProducerClient() { return producer_client_.get(); }