[inspector] Build inspector under v8_enable_inspector build flag.

src/inspector/V8InternalValueType.cpp

Index: src/inspector/V8InternalValueType.cpp
diff --git a/src/inspector/V8InternalValueType.cpp b/src/inspector/V8InternalValueType.cpp
index 21640e2c3b8dbcf55b60135c84c01ef350a719f6..2eade4ff56d3b3272c135ba16826d39ec2495fa0 100644
--- a/src/inspector/V8InternalValueType.cpp
+++ b/src/inspector/V8InternalValueType.cpp
@@ -29,7 +29,7 @@ v8::Local<v8::String> subtypeForInternalType(v8::Isolate* isolate,
     case V8InternalValueType::kScopeList:
       return toV8StringInternalized(isolate, "internal#scopeList");
   }
-  NOTREACHED();
+  UNREACHABLE();
   return v8::Local<v8::String>();
 }