Sync Document.createProcessingInstruction() with spec

http://dom.spec.whatwg.org/#dom-document-createprocessinginstruction

Firefox Nightly already passes the added tests, so we would not be the
first to adopt these changes.

BUG=325922

Review URL: https://codereview.chromium.org/100433004

git-svn-id: svn://svn.chromium.org/blink/trunk@163335 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[DevTools] Inspector should allow resetting zoom level using the numpad0 key.

Inspector supports having multiple zoom levels on the frontend. It also supports
resetting the zoom level to default using the key: ctrl/cmd+'0'. At the same time
the developers can use the numpad '+' and '-' along with ctrl/cmd to increase/decrease
zoom level. Currently resetting zoom level to default is not supported for the key:
ctrl/cmd+'numpad0'. This patch adds the support for using the numpad0 to reset the zoom
level.

BUG=326414

Review URL: https://codereview.chromium.org/101933006

git-svn-id: svn://svn.chromium.org/blink/trunk@163336 bbb929c8-8fbe-4397-9dbb-9b2b20218538