Download location: Remove checkbox left padding in location dialog.

This CL removes 5dp padding in the checkbox, so it can align with the
icons above.

Bug: 864785
Change-Id: I6881b0269498eb50bc7b5dd8d337fdedd8527f59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1604467Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658747}

chrome/android/java/res_download/layout/download_location_dialog.xml

@@ -70,7 +70,8 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:text="@string/download_location_dialog_checkbox"
-            android:layout_marginTop="16dp" />
+            android:layout_marginTop="16dp"
+            android:layout_marginStart="-5dp"/>
 
     </LinearLayout>