DevTools: Do not save split view size on show mode changes.

BUG=348887
R=dgozman@chromium.org, dgozman

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168608

Review URL: https://codereview.chromium.org/185943004

git-svn-id: svn://svn.chromium.org/blink/trunk@168775 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Reset media controls when load() is called

Calling reset() in configureMediaControls() is a slightly bigger hammer
than should be needed, but it isn't called very often so it shouldn't
matter in practice. Ideally MediaControls should be hooked to the same
fine-grained events as scripts see, but that's for the future.

BUG=350310

Review URL: https://codereview.chromium.org/190333002

git-svn-id: svn://svn.chromium.org/blink/trunk@168776 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Remove unused SidebarOverlay class.

R=dgozman@chromium.org, dgozman, pfeldman

Review URL: https://codereview.chromium.org/190143004

git-svn-id: svn://svn.chromium.org/blink/trunk@168777 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Generate the isSVG*Element() / toSVG*Element() helper functions

Generate the isSVG*Element() / toSVG*Element() helper functions, similarly to
the HTML ones. This also makes the new Traversal<> API work for SVG Elements.

R=esprehn, pdr
BUG=346095

Review URL: https://codereview.chromium.org/189463005

git-svn-id: svn://svn.chromium.org/blink/trunk@168778 bbb929c8-8fbe-4397-9dbb-9b2b20218538