bindings: Pass IDL dictionary references instead of pointers

Source/modules/webmidi/MIDIAccessInitializer.cpp

Index: Source/modules/webmidi/MIDIAccessInitializer.cpp
diff --git a/Source/modules/webmidi/MIDIAccessInitializer.cpp b/Source/modules/webmidi/MIDIAccessInitializer.cpp
index e4fd16924f7287a4f232aae55aa3f0310c18fa86..b1d1013dac8e0aed3bef0d3238bbb74611a09c3a 100644
--- a/Source/modules/webmidi/MIDIAccessInitializer.cpp
+++ b/Source/modules/webmidi/MIDIAccessInitializer.cpp
@@ -17,13 +17,12 @@
 
 namespace blink {
 
-MIDIAccessInitializer::MIDIAccessInitializer(ScriptState* scriptState, const MIDIOptions* options)
+MIDIAccessInitializer::MIDIAccessInitializer(ScriptState* scriptState, const MIDIOptions& options)
     : ScriptPromiseResolver(scriptState)
     , m_requestSysex(false)
 {
-    ASSERT(options);
-    if (options->hasSysex())
-        m_requestSysex = options->sysex();
+    if (options.hasSysex())
+        m_requestSysex = options.sysex();
 }
 
 MIDIAccessInitializer::~MIDIAccessInitializer()