Switch HTMLCanvasElement over to new-style ExceptionState.

Source/core/html/HTMLCanvasElement.cpp

Index: Source/core/html/HTMLCanvasElement.cpp
diff --git a/Source/core/html/HTMLCanvasElement.cpp b/Source/core/html/HTMLCanvasElement.cpp
index 93c5e2bfc4f567a70b5f452c1cb989ca0138f863..57b7fc25cd685ac6f5153f6eda76892fdfd2705f 100644
--- a/Source/core/html/HTMLCanvasElement.cpp
+++ b/Source/core/html/HTMLCanvasElement.cpp
@@ -373,7 +373,7 @@ String HTMLCanvasElement::toEncodingMimeType(const String& mimeType)
 String HTMLCanvasElement::toDataURL(const String& mimeType, const double* quality, ExceptionState& exceptionState)
 {
     if (!m_originClean) {
-        exceptionState.throwSecurityError(ExceptionMessages::failedToExecute("toDataURL", "HTMLCanvasElement", "tainted canvases may not be exported."));
+        exceptionState.throwSecurityError("tainted canvases may not be exported.");

[Mike West, 2013/11/29 08:26:45]

Nit: If you're changing this anyway, can you capitalize "Tainted"?

[sof, 2013/11/29 08:58:03]

Done, and same for the other taint-related error messages.

(Will assume ok and proceed to commit.)

         return String();
     }