Drop [LegacyInterfaceTypeChecking] where trivial in Web Audio

third_party/WebKit/LayoutTests/webaudio/audiobuffer-copy-channel.html

Index: third_party/WebKit/LayoutTests/webaudio/audiobuffer-copy-channel.html
diff --git a/third_party/WebKit/LayoutTests/webaudio/audiobuffer-copy-channel.html b/third_party/WebKit/LayoutTests/webaudio/audiobuffer-copy-channel.html
index 5cda524ff00ffd5e07216de28f5c6b071766769c..235b7f076b9cbdb7994582c53b8c618c09b1c3ce 100644
--- a/third_party/WebKit/LayoutTests/webaudio/audiobuffer-copy-channel.html
+++ b/third_party/WebKit/LayoutTests/webaudio/audiobuffer-copy-channel.html
@@ -112,10 +112,10 @@
           }).notThrow();
         Should("buffer.copyFromChannel(null, 0)", function () {
           buffer.copyFromChannel(null, 0);
-        }).throw("TypeMismatchError");
+        }).throw("TypeError");
         Should("buffer.copyFromChannel(context, 0)", function () {
           buffer.copyFromChannel(context, 0);
-        }).throw("TypeMismatchError");
+        }).throw("TypeError");
         Should("buffer.copyFromChannel(x, -1)", function () {
           buffer.copyFromChannel(x, -1);
         }).throw("IndexSizeError");
@@ -139,10 +139,10 @@
         shouldBeDefined("AudioBuffer.prototype.copyToChannel");
         Should("buffer.copyToChannel(null, 0)", function () {
           buffer.copyToChannel(null, 0);
-        }).throw("TypeMismatchError");
+        }).throw("TypeError");
         Should("buffer.copyToChannel(context, 0)", function () {
           buffer.copyToChannel(context, 0);
-        }).throw("TypeMismatchError");
+        }).throw("TypeError");
         Should("buffer.copyToChannel(x, -1)", function () {
           buffer.copyToChannel(x, -1);
         }).throw("IndexSizeError");
@@ -258,7 +258,7 @@
       );
 
       successfullyParsed = true;
-      
+
     </script>
 
   </body>