[inspector] fixed one more size_t -> int conversion

test/inspector/inspector-test.cc

Index: test/inspector/inspector-test.cc
diff --git a/test/inspector/inspector-test.cc b/test/inspector/inspector-test.cc
index f2b24b8ddf65e826592a5ead958f157e43810429..b7165acc2a57293bd96ef644bfdd139f32e351a4 100644
--- a/test/inspector/inspector-test.cc
+++ b/test/inspector/inspector-test.cc
@@ -157,12 +157,12 @@ v8::Local<v8::String> ToString(v8::Isolate* isolate,
   if (string.is8Bit())
     return v8::String::NewFromOneByte(isolate, string.characters8(),
                                       v8::NewStringType::kNormal,
-                                      string.length())
+                                      static_cast<int>(string.length()))
         .ToLocalChecked();
   else
     return v8::String::NewFromTwoByte(isolate, string.characters16(),
                                       v8::NewStringType::kNormal,
-                                      string.length())
+                                      static_cast<int>(string.length()))
         .ToLocalChecked();
 }