Require extractable=false for KDF import

components/webcrypto/status.h

Index: components/webcrypto/status.h
diff --git a/components/webcrypto/status.h b/components/webcrypto/status.h
index 73397d3f92a037541bce9f0cb14deb2df7ab8ffc..5933623e848d2f7bab70bca759e8597cbac74a5a 100644
--- a/components/webcrypto/status.h
+++ b/components/webcrypto/status.h
@@ -273,6 +273,10 @@ class Status {
   // PBKDF2 was called with iterations == 0.
   static Status ErrorPbkdf2Iterations0();
 
+  // Tried importing a key with extractable=true for one of the *KDF
+  // algorithms.
+  static Status ErrorImportExtractableKdfKey();
+
  private:
   enum Type { TYPE_ERROR, TYPE_SUCCESS };