Add a cancel button to the send confirmation dialog

Bug: 10641724
Change-Id: I33a13404487ff456f0b968e5b5c4db2ad9a5dd9f
diff --git a/src/com/android/mail/compose/ComposeActivity.java b/src/com/android/mail/compose/ComposeActivity.java
index c1dd6b1..0879cbd 100644
--- a/src/com/android/mail/compose/ComposeActivity.java
+++ b/src/com/android/mail/compose/ComposeActivity.java
@@ -2677,6 +2677,7 @@
                                             showToast);
                                 }
                             })
+                    .setNegativeButton(R.string.cancel, null)
                     .create();
         }
     }