Let WebVTTRegions depends_on=VideoTrack and simplify IDL

Let WebVTTRegions depends_on=VideoTrack and simplify IDL

BUG=313604
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=161218

[acolwell GONE FROM CHROMIUM, 2013-11-01 22:17:00]

lgtm. Adding eseidel@ since this touches IDL.

[eseidel, 2013-11-01 22:19:20]

lgtm

[commit-bot: I haz the power, 2013-11-01 22:19:35]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/54903008/1

[commit-bot: I haz the power, 2013-11-01 22:19:37]

Failed to apply patch for Source/core/html/track/VTTRegion.idl:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  can't find file to patch at input line 6
  Perhaps you used the wrong -p or --strip option?
  The text leading up to this was:
  --------------------------
  |Index: Source/core/html/track/VTTRegion.idl
  |diff --git a/Source/core/html/track/VTTRegion.idl
b/Source/core/html/track/VTTRegion.idl
  |index
45347a645628c4a318a73d9289fd79803bb6f7e6..d3793af64d2a751f9bbaa737227eb7e85f8b2d5f
100644
  |--- a/Source/core/html/track/VTTRegion.idl
  |+++ b/Source/core/html/track/VTTRegion.idl
  --------------------------
  No file to patch.  Skipping patch.
  1 out of 1 hunk ignored

Patch:       Source/core/html/track/VTTRegion.idl
Index: Source/core/html/track/VTTRegion.idl
diff --git a/Source/core/html/track/VTTRegion.idl
b/Source/core/html/track/VTTRegion.idl
index
45347a645628c4a318a73d9289fd79803bb6f7e6..d3793af64d2a751f9bbaa737227eb7e85f8b2d5f
100644
--- a/Source/core/html/track/VTTRegion.idl
+++ b/Source/core/html/track/VTTRegion.idl
@@ -25,7 +25,6 @@
 
 [
     Constructor(),
-    RuntimeEnabled=VideoTrack,
     RuntimeEnabled=WebVTTRegions
 ] interface VTTRegion {
     readonly attribute TextTrack track;

[philipj_slow, 2013-11-01 22:24:11]

Sorry, should have noted that this depends on
https://codereview.chromium.org/55653003/ to land first.

[commit-bot: I haz the power, 2013-11-02 04:29:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/54903008/1

[commit-bot: I haz the power, 2013-11-02 05:43:46]

Change committed as 161218