WebCrypto: Fix a crash when passing invalid ArrayBufferView to importKey.

LayoutTests/crypto/importKey.html

Index: LayoutTests/crypto/importKey.html
diff --git a/LayoutTests/crypto/importKey.html b/LayoutTests/crypto/importKey.html
index d66506f8f825c8d18903db2cd0b903d432444588..4222bf9fda6713e9cbdc05423774126ec7963f3f 100644
--- a/LayoutTests/crypto/importKey.html
+++ b/LayoutTests/crypto/importKey.html
@@ -205,6 +205,10 @@ allTests = [
         // FIXME: http://crbug.com/262383
         //shouldThrow("crypto.subtle.importKey(keyFormat, data, algorithm, extractable, undefined)");
 
+        // Invalid data
+        shouldThrow("crypto.subtle.importKey(keyFormat, [], algorithm, extractable, keyUsages)");
+        shouldThrow("crypto.subtle.importKey(keyFormat, null, algorithm, extractable, keyUsages)");

[abarth-chromium, 2013/07/25 23:31:30]

null is a perfectly fine ArrayBufferView.  What happens if you pass in something
like 5 or document.body ?

+
         startNextTest();
     },