Revert of [inspector] always include user scripts in the snapshot.

src/inspector/v8-debugger-script.cc

Index: src/inspector/v8-debugger-script.cc
diff --git a/src/inspector/v8-debugger-script.cc b/src/inspector/v8-debugger-script.cc
index e0aaceb8880f7084e3b72e4df0e79112b79f0da2..d151ab821f58c6d872baa37b994bbf7ccbf1f918 100644
--- a/src/inspector/v8-debugger-script.cc
+++ b/src/inspector/v8-debugger-script.cc
@@ -138,7 +138,11 @@
       m_endColumn = m_startColumn;
     }
 
-    USE(script->ContextId().To(&m_executionContextId));
+    v8::Local<v8::Value> contextData;
+    if (script->ContextData().ToLocal(&contextData) && contextData->IsInt32()) {
+      m_executionContextId =
+          static_cast<int>(contextData.As<v8::Int32>()->Value());
+    }
 
     if (script->Source().ToLocal(&tmp)) {
       m_source = toProtocolString(tmp);