Switch HTMLCanvasElement over to new-style ExceptionState.

Source/core/html/canvas/CanvasRenderingContext2D.cpp

Index: Source/core/html/canvas/CanvasRenderingContext2D.cpp
diff --git a/Source/core/html/canvas/CanvasRenderingContext2D.cpp b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
index 5e926d794a99b9a7203fbff58192e59716b48ce9..8ec03eb155564167d5e11c431fabffec6ed8797f 100644
--- a/Source/core/html/canvas/CanvasRenderingContext2D.cpp
+++ b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
@@ -1882,7 +1882,7 @@ PassRefPtr<ImageData> CanvasRenderingContext2D::webkitGetImageDataHD(float sx, f
 PassRefPtr<ImageData> CanvasRenderingContext2D::getImageData(ImageBuffer::CoordinateSystem coordinateSystem, float sx, float sy, float sw, float sh, ExceptionState& exceptionState) const
 {
     if (!canvas()->originClean()) {
-        exceptionState.throwSecurityError(ExceptionMessages::failedToExecute("getImageData", "CanvasRenderingContext2D", "the canvas has been tainted by cross-origin data."));
+        exceptionState.throwSecurityError(ExceptionMessages::failedToExecute("getImageData", "CanvasRenderingContext2D", "The canvas has been tainted by cross-origin data."));
         return 0;
     }