Fix check-webkit-style errors in core/accessibility.

This is just to make future refactoring easier, since check-webkit-style
makes you fix any style errors when you modify a file in any way.

BUG=none

Review URL: https://codereview.chromium.org/27116005

git-svn-id: svn://svn.chromium.org/blink/trunk@159785 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Teach InspectorInstrumentation how to turn a Node into a Document

This makes the InspectorDOMAgent callbacks less verbose and avoids taking
the address of Node::document() in lots of places.

Also added an inspectorAgentsFor(Document&) callback which avoids
NULL-checking the document.

R=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/27066002

git-svn-id: svn://svn.chromium.org/blink/trunk@159786 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add a comment explaining why EventSource::suspend() is not overridden.

BUG=none

Review URL: https://codereview.chromium.org/27294002

git-svn-id: svn://svn.chromium.org/blink/trunk@159787 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Adding derived sources for platform.

Pending moves from core/platform to platform have a dependency on
derived sources. Add support in this changelist.

R=abarth@chromium.org, abarth, eseidel
BUG=297477

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=159354

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=159389

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=159545

Review URL: https://codereview.chromium.org/26697002

git-svn-id: svn://svn.chromium.org/blink/trunk@159788 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove some useless null checks in Element/NamedNodeMap
    
Make shouldIgnoreAttributeCase() a method of Element, thus avoiding
unnecessary element null checks.
    
This is based on WebKit r122767 by <akling@apple.com>.
    
R=tkent

Review URL: https://codereview.chromium.org/26955005

git-svn-id: svn://svn.chromium.org/blink/trunk@159789 bbb929c8-8fbe-4397-9dbb-9b2b20218538