Mark image-currentsrc.html as being flaky.

The test is still very flaky on Windows, and somewhat flaky on other
platforms.

TBR=jchaffraix@chromium.org, yoav@yoav.ws
BUG=380664

Review URL: https://codereview.chromium.org/311133002

git-svn-id: svn://svn.chromium.org/blink/trunk@175483 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/TestExpectations

@@ -1071,6 +1071,8 @@ crbug.com/380167 [ Mac ] plugins/destroy-reentry.html [ Failure Pass ]
 
 crbug.com/380649 [ Mac ] fast/dom/HTMLScriptElement/dont-load-unknown-type.html [ Failure ]
 
+crbug.com/380664 http/tests/images/image-currentsrc.html [ Failure Pass ]
+
 # Temporarily skipped until Chromium side change lands.
 crbug.com/308768 http/tests/security/XFrameOptions/x-frame-options-deny-meta-tag-in-body.html [ Skip ]
 crbug.com/308768 http/tests/security/XFrameOptions/x-frame-options-deny-meta-tag-parent-same-origin-deny.html [ Skip ]