[webcrypto] Don't throw any extra WebIDL exceptions from WebCrypto methods.

Source/modules/crypto/SubtleCrypto.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 [
     WillBeGarbageCollected,
     NoInterfaceObject
 ] interface SubtleCrypto {
-    [RaisesException] Promise encrypt(Dictionary algorithm, Key key, ArrayBufferView data);
-    [RaisesException] Promise decrypt(Dictionary algorithm, Key key, ArrayBufferView data);
-    [RaisesException] Promise sign(Dictionary algorithm, Key key, ArrayBufferView data);
-    [RaisesException, ImplementedAs=verifySignature] Promise verify(Dictionary algorithm, Key key, ArrayBufferView signature, ArrayBufferView data);
-    [RaisesException] Promise digest(Dictionary algorithm, ArrayBufferView data);
+    Promise encrypt(Dictionary algorithm, Key key, ArrayBufferView data);
+    Promise decrypt(Dictionary algorithm, Key key, ArrayBufferView data);
+    Promise sign(Dictionary algorithm, Key key, ArrayBufferView data);
+    [ImplementedAs=verifySignature] Promise verify(Dictionary algorithm, Key key, ArrayBufferView signature, ArrayBufferView data);
+    Promise digest(Dictionary algorithm, ArrayBufferView data);
 
-    [RaisesException] Promise generateKey(Dictionary algorithm, boolean extractable, DOMString[] keyUsages);
-    [RaisesException] Promise importKey(DOMString format, ArrayBufferView keyData, Dictionary algorithm, boolean extractable, DOMString[] keyUsages);
-    [RaisesException] Promise exportKey(DOMString format, Key key);
+    Promise generateKey(Dictionary algorithm, boolean extractable, DOMString[] keyUsages);
+    Promise importKey(DOMString format, ArrayBufferView keyData, Dictionary algorithm, boolean extractable, DOMString[] keyUsages);
+    Promise exportKey(DOMString format, Key key);
 
-    [RaisesException] Promise wrapKey(DOMString format, Key key, Key wrappingKey, Dictionary wrapAlgorithm);
-    [RaisesException] Promise unwrapKey(DOMString format, ArrayBufferView wrappedKey, Key unwrappingKey, Dictionary unwrapAlgorithm, Dictionary unwrappedKeyAlgorithm, boolean extractable, DOMString[] keyUsages);
+    Promise wrapKey(DOMString format, Key key, Key wrappingKey, Dictionary wrapAlgorithm);
+    Promise unwrapKey(DOMString format, ArrayBufferView wrappedKey, Key unwrappingKey, Dictionary unwrapAlgorithm, Dictionary unwrappedKeyAlgorithm, boolean extractable, DOMString[] keyUsages);
 };