Replace [CallWith=ExecutionContext] with [CallWith=ScriptState]

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 3aae6826866c9b26f448e713f97f8db2c9c0e47d..25a5149eb85a653be7abf74d8536284770d7b9a0 100644
--- a/third_party/WebKit/Source/modules/mediasource/URLMediaSource.cpp
+++ b/third_party/WebKit/Source/modules/mediasource/URLMediaSource.cpp
@@ -36,11 +36,12 @@
 
 namespace blink {
 
-String URLMediaSource::createObjectURL(ExecutionContext* executionContext,
+String URLMediaSource::createObjectURL(ScriptState* scriptState,
                                        MediaSource* source) {
   // Since WebWorkers cannot obtain MediaSource objects, we should be on the
   // main thread.
   DCHECK(isMainThread());
+  ExecutionContext* executionContext = scriptState->getExecutionContext();
   DCHECK(executionContext);
   DCHECK(source);