Fix some small syntax issues in W3CImportExpectations

Currently there are some entries in W3CImportExpectations that do not closely
follow the syntax and hence cannot be picked up by DirectoryOwnersExtractor.
This CL fixes these entries. It is also in prepartion for converting the [Pass]
entries to OWNERS files, as the conversion script will be based on
DirectoryOwnersExtractor. (I could make these changes locally and then run the
script, but that would make the conversion process harder to trace and debug, in
case there is any need in the future.)

Bug: 713987
Change-Id: Iab1ed744e6fedbf9e805113badd4ff50e9e0347c
Reviewed-on: https://chromium-review.googlesource.com/580395Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488495}

third_party/WebKit/LayoutTests/W3CImportExpectations

@@ -20,7 +20,7 @@
 ## Owners: paint-dev@chromium.org
 # external/wpt/2dcontext [ Pass ]
 ## Owners: garykac@chromium.org
-# external/wpt/clipboard-apis [Pass]
+# external/wpt/clipboard-apis [ Pass ]
 ## Owners: jsbell@chromium.org
 # external/wpt/FileAPI [ Pass ]
 ## Owners: jsbell@chromium.org
@@ -170,9 +170,9 @@ external/wpt/css/css-pseudo-4 [ Skip ]
 external/wpt/css/css-regions-1 [ Skip ]
 ## Owners: kojii@chromium.org
 # external/wpt/css/css-rhythm-1 [ Pass ]
+# external/wpt/css/css-scoping-1 [ Pass ]
 external/wpt/css/css-round-display-1 [ Skip ]
 external/wpt/css/css-ruby-1 [ Skip ]
-#external/wpt/css/css-scoping-1 [ Pass ]
 ## Owners: bjonesbe@adobe.com
 # external/wpt/css/css-shapes-1 [ Pass ]
 external/wpt/css/css-speech-1 [ Skip ]