Move ScriptState::GetExecutionContext (Part 4)

third_party/WebKit/Source/core/streams/UnderlyingSourceBase.h

Index: third_party/WebKit/Source/core/streams/UnderlyingSourceBase.h
diff --git a/third_party/WebKit/Source/core/streams/UnderlyingSourceBase.h b/third_party/WebKit/Source/core/streams/UnderlyingSourceBase.h
index ccdd413eda91d3692e7f81d4c9dc30077cc86b2a..d04c18858bafdfa39b0f140592981c65680b219b 100644
--- a/third_party/WebKit/Source/core/streams/UnderlyingSourceBase.h
+++ b/third_party/WebKit/Source/core/streams/UnderlyingSourceBase.h
@@ -12,6 +12,7 @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/dom/ContextLifecycleObserver.h"
+#include "core/dom/ExecutionContext.h"
 #include "platform/heap/GarbageCollected.h"
 #include "platform/heap/Handle.h"
 
@@ -50,7 +51,7 @@ class CORE_EXPORT UnderlyingSourceBase
 
  protected:
   explicit UnderlyingSourceBase(ScriptState* script_state)
-      : ContextLifecycleObserver(script_state->GetExecutionContext()) {}
+      : ContextLifecycleObserver(ExecutionContext::From(script_state)) {}
 
   ReadableStreamController* Controller() const { return controller_; }