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

third_party/WebKit/Source/modules/mediastream/URLMediaStream.cpp

Index: third_party/WebKit/Source/modules/mediastream/URLMediaStream.cpp
diff --git a/third_party/WebKit/Source/modules/mediastream/URLMediaStream.cpp b/third_party/WebKit/Source/modules/mediastream/URLMediaStream.cpp
index 552239d0b13ef13a11ef7b7b00feac95fbd4c7e7..3276aac9272ee21a4f67605556cb1c71214a82d4 100644
--- a/third_party/WebKit/Source/modules/mediastream/URLMediaStream.cpp
+++ b/third_party/WebKit/Source/modules/mediastream/URLMediaStream.cpp
@@ -36,11 +36,12 @@
 
 namespace blink {
 
-String URLMediaStream::createObjectURL(ExecutionContext* executionContext,
+String URLMediaStream::createObjectURL(ScriptState* scriptState,
                                        MediaStream* stream) {
   // Since WebWorkers cannot obtain Stream objects, we should be on the main
   // thread.
   DCHECK(isMainThread());
+  ExecutionContext* executionContext = scriptState->getExecutionContext();
   DCHECK(executionContext);
   DCHECK(stream);