Refactoring source image usage in CanvasRenderingContext2D

LayoutTests/fast/canvas/drawImage-with-broken-image.html

Index: LayoutTests/fast/canvas/drawImage-with-broken-image.html
diff --git a/LayoutTests/fast/canvas/drawImage-with-broken-image.html b/LayoutTests/fast/canvas/drawImage-with-broken-image.html
index fc3e96cfff82807041886bb9fdeb5d14e7faeb8c..92b1778ef9df912ed2cdb6861095ad47481d9a14 100644
--- a/LayoutTests/fast/canvas/drawImage-with-broken-image.html
+++ b/LayoutTests/fast/canvas/drawImage-with-broken-image.html
@@ -7,9 +7,6 @@
     window.jsTestIsAsync = true;
     description("This test checks behavior of Canvas::drawImage with a broken source image.");
 
-    var InvalidStateError = "InvalidStateError: Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The source width is 0.";
-    var TypeMismatchError = "TypeMismatchError: The type of an object was incompatible with the expected type of the parameter associated to the object.";
-
     // Create an image with invalid data.
     var invalidImage = new Image();
     invalidImage.src = 'resources/repaint.js';
@@ -23,11 +20,11 @@
         shouldThrow("ctx.drawImage(null, 0, 0, 20, 20, 0, 0, 20, 20)");
 
         // broken images should not throw
-        shouldBe("ctx.drawImage(invalidImage, 0, 0)", "undefined");
-        shouldBe("ctx.drawImage(invalidImage, 0, 0, 20, 20)", "undefined");
-        shouldBe("ctx.drawImage(invalidImage, 0, 0, 20, 20, 0, 0, 20, 20)", "undefined");
-        shouldBe("ctx.drawImage(invalidImage, 0, 0, 0, 20)", "undefined");
-        shouldBe("ctx.drawImage(invalidImage, 0, 0, 0, 20, 0, 0, 20, 20)", "undefined");
+        shouldThrow("ctx.drawImage(invalidImage, 0, 0)");
+        shouldThrow("ctx.drawImage(invalidImage, 0, 0, 20, 20)");
+        shouldThrow("ctx.drawImage(invalidImage, 0, 0, 20, 20, 0, 0, 20, 20)");
+        shouldThrow("ctx.drawImage(invalidImage, 0, 0, 0, 20)");
+        shouldThrow("ctx.drawImage(invalidImage, 0, 0, 0, 20, 0, 0, 20, 20)");
 
         finishJSTest();
     }