Remove LoadableTextTrackClient

It is completely unused.

BUG=313287

Review URL: https://codereview.chromium.org/53413003

git-svn-id: svn://svn.chromium.org/blink/trunk@160993 bbb929c8-8fbe-4397-9dbb-9b2b20218538
IDL compiler: 3 more special types for methods

3 last special types:
* CompareHow
* Dictionary
* MediaQueryListListener
Only Dictionary involves a new block of code; others are just type handling.

Also a bit of cleaning up of type code and test categories.

BUG=239771
NOTRY=true

Review URL: https://codereview.chromium.org/52353003

git-svn-id: svn://svn.chromium.org/blink/trunk@160994 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add a test for the timing of start events with varying delays

I couldn't find a test which checks this explicitly.

BUG=248938
R=timloh@chromium.org

Review URL: https://codereview.chromium.org/52053002

git-svn-id: svn://svn.chromium.org/blink/trunk@160995 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Rename some table headings in LayoutTest results.html

It's confusing to have a column labelled "expected failure" that usually
contains the word "pass". I've trimmed these columns to just be labeled
"actual" and "expected".

R=ojan@chromium.org

Review URL: https://codereview.chromium.org/48213003

git-svn-id: svn://svn.chromium.org/blink/trunk@160996 bbb929c8-8fbe-4397-9dbb-9b2b20218538