Fix data race in InspectorInstrumentation::hasFrontends

Source/core/inspector/InspectorInstrumentation.h

Index: Source/core/inspector/InspectorInstrumentation.h
diff --git a/Source/core/inspector/InspectorInstrumentation.h b/Source/core/inspector/InspectorInstrumentation.h
index 440c7d0de6724225ab0ecd4b25cbe671189f1a2e..30bda7daa2c24085c1b21079a1969a05aaeb089c 100644
--- a/Source/core/inspector/InspectorInstrumentation.h
+++ b/Source/core/inspector/InspectorInstrumentation.h
@@ -91,7 +91,7 @@ private:
 
 inline void frontendCreated() { atomicIncrement(&FrontendCounter::s_frontendCounter); }
 inline void frontendDeleted() { atomicDecrement(&FrontendCounter::s_frontendCounter); }
-inline bool hasFrontends() { return FrontendCounter::s_frontendCounter; }
+inline bool hasFrontends() { return acquireLoad(&FrontendCounter::s_frontendCounter); }
 
 CORE_EXPORT void registerInstrumentingAgents(InstrumentingAgents*);
 CORE_EXPORT void unregisterInstrumentingAgents(InstrumentingAgents*);