Drop [LegacyInterfaceTypeChecking] where trivial in Web Audio

third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js

 if (window.testRunner)
     testRunner.overridePreference("WebKitWebAudioEnabled", "1");
 
 function writeString(s, a, offset) {
     for (var i = 0; i < s.length; ++i) {
         a[offset + i] = s.charCodeAt(i);
     }
 }
 
 function writeInt16(n, a, offset) {
@@ skipping 579 matching lines @@
         }
 
         try {
             this.target();
             this._testFailed('did not throw an exception');
         } catch (error) {
             if (errorType === undefined)
                 this._testPassed('threw an exception of type ' + error.name);
             else if (error.name === errorType)
                 this._testPassed('threw ' + errorType + ': ' + error.message);
+            else if (self.hasOwnProperty(errorType) && error instanceof self[errorType])
+                this._testPassed('threw ' + errorType + ': ' + error.message);
             else
                 this._testFailed('threw ' + error.name + ' instead of ' + exception);
         }
         return this._success;
     };
 
     // Check if |func| does not throw an exception.
     //
     // Example:
     // Should('var foo = "bar"', function () { var foo = 'bar'; }).notThrow();
@@ skipping 221 matching lines @@
             if (opts.hasOwnProperty('numberOfErrorLog'))
                 _opts.numberOfErrorLog = opts.numberOfErrorLog;
             if (opts.hasOwnProperty('numberOfArrayLog'))
                 _opts.numberOfArrayLog = opts.numberOfArrayLog;
         }
 
         return new ShouldModel(desc, target, _opts);
     };
 
 })();