Mark editing/pasteboard/drop-file-svg.html as Pass Leak on Trusty

TBR=anthonyvd

Bug: 809609
Change-Id: I5ed542e233feae2bc6c5faa34805837c7f0ee555
Reviewed-on: https://chromium-review.googlesource.com/905096Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534816}

third_party/WebKit/LayoutTests/LeakExpectations

@@ -50,6 +50,8 @@ crbug.com/667560 [ Linux ] http/tests/devtools/console/console-search.js [ Leak
 crbug.com/765721 [ Linux ] http/tests/navigation/navigation-interrupted-by-fragment.html [ Pass Leak ]
 crbug.com/765721 [ Linux ] virtual/stable/http/tests/navigation/navigation-interrupted-by-fragment.html [ Pass Leak ]
 
+crbug.com/809609 [ Linux ] editing/pasteboard/drop-file-svg.html [ Pass Leak ]
+
 ###########################################################################
 # WARNING: Memory leaks must be fixed asap. Sheriff is expected to revert #
 # culprit CLs instead of suppressing the leaks. If you have any question, #