Marking indexdb tests cursor-continue-validity.html and indexes.html as SLOW on Win7 (dbg)

TBR=zerny@chromium.org
BUG=402379
NOTRY=true

Review URL: https://codereview.chromium.org/462553002

git-svn-id: svn://svn.chromium.org/blink/trunk@179923 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/TestExpectations

@@ -1305,3 +1305,6 @@ crbug.com/357462 http/tests/security/contentSecurityPolicy/1.1/frame-ancestors/f
 crbug.com/357462 http/tests/security/contentSecurityPolicy/1.1/frame-ancestors/frame-ancestors-star-allow-crossorigin.html [ Failure Pass Timeout ]
 
 crbug.com/401902  [ Win7 Debug ] virtual/gpu/fast/canvas/canvas-lose-restore-googol-size.html [ Pass Failure ]
+
+crbug.com/402379 [ Win7 Debug ] storage/indexeddb/cursor-continue-validity.html [ Pass Slow ]
+crbug.com/402379 [ Win7 Debug ] storage/indexeddb/mozilla/indexes.html [ Pass Slow ]