[ModalDialog] Fix modal dialog button having the wrong text

Bug: 904471
Change-Id: I0080d11d52d311f7901e1953dc98e9e7bcc25d67
Reviewed-on: https://chromium-review.googlesource.com/c/1343278Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Becky Zhou <huayinz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609452}

chrome/android/java/src/org/chromium/chrome/browser/modaldialog/ModalDialogView.java

@@ -214,7 +214,7 @@ public class ModalDialogView implements View.OnClickListener {
             setButtonText(ButtonType.NEGATIVE, resources.getString(mParams.negativeButtonTextId));
             mNegativeButton.setOnClickListener(this);
         } else if (mParams.negativeButtonText != null) {
-            setButtonText(ButtonType.POSITIVE, mParams.negativeButtonText);
+            setButtonText(ButtonType.NEGATIVE, mParams.negativeButtonText);
         }
     }