Revert of Move ScriptState::GetExecutionContext (Part 5)

third_party/WebKit/Source/modules/mediasource/URLMediaSource.cpp

Index: third_party/WebKit/Source/modules/mediasource/URLMediaSource.cpp
diff --git a/third_party/WebKit/Source/modules/mediasource/URLMediaSource.cpp b/third_party/WebKit/Source/modules/mediasource/URLMediaSource.cpp
index 0306330525fa5d41b9fdb22e7207eabb0852003a..1885723ad2cc924ede59bb7f75acb16b7e8e527c 100644
--- a/third_party/WebKit/Source/modules/mediasource/URLMediaSource.cpp
+++ b/third_party/WebKit/Source/modules/mediasource/URLMediaSource.cpp
@@ -32,7 +32,6 @@
 
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMURL.h"
-#include "core/dom/ExecutionContext.h"
 #include "core/frame/UseCounter.h"
 #include "modules/mediasource/MediaSource.h"
 
@@ -43,7 +42,7 @@ String URLMediaSource::createObjectURL(ScriptState* script_state,
   // Since WebWorkers cannot obtain MediaSource objects, we should be on the
   // main thread.
   DCHECK(IsMainThread());
-  ExecutionContext* execution_context = ExecutionContext::From(script_state);
+  ExecutionContext* execution_context = script_state->GetExecutionContext();
   DCHECK(execution_context);
   DCHECK(source);