[gn] Enable stricter build flags

src/libsampler/sampler.h

Index: src/libsampler/sampler.h
diff --git a/src/libsampler/sampler.h b/src/libsampler/sampler.h
index 7ae3c8c4766d8b2f6f630e7df592d4fd363204c8..311d577e1e4ecc66a342ad218f4586bd51d975be 100644
--- a/src/libsampler/sampler.h
+++ b/src/libsampler/sampler.h
@@ -53,12 +53,12 @@ class Sampler {
   void DecreaseProfilingDepth();
 
   // Whether the sampler is running (that is, consumes resources).
-  bool IsActive() const { return base::NoBarrier_Load(&active_); }
+  bool IsActive() const { return base::NoBarrier_Load(&active_) != 0; }
 
   // CpuProfiler collects samples by calling DoSample directly
   // without calling Start. To keep it working, we register the sampler
   // with the CpuProfiler.
-  bool IsRegistered() const { return base::NoBarrier_Load(&registered_); }
+  bool IsRegistered() const { return base::NoBarrier_Load(&registered_) != 0; }
 
   void DoSample();