Do not touch shadow elements created by other InputType objects.

Fix a bug that UI elements in multiple-fields inputs don't work after
input.type = input.type.
This bug is a regression by Blink r151841 [1]

BaseMultipleFieldsDateAndTimeInputType destructor disconnects UI elments from
their owners. Constructing and destructing unused
BaseMultipleFieldDateAndTimeInputType object in HTMLInputType::updateType
diconnected existing ownership relations build by another
BaseMultipleFieldDateAndTimeInputType object.

BaseMultipleFieldDateAndTimeInputType object should check if shadow elements
were created by it.

BUG=277843

Review URL: https://chromiumcodereview.appspot.com/23444009

git-svn-id: svn://svn.chromium.org/blink/trunk@156902 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[Inspect DOM properties] incorrect CSS Selector Syntax

EOM

BUG=280527

Review URL: https://chromiumcodereview.appspot.com/23449010

git-svn-id: svn://svn.chromium.org/blink/trunk@156903 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add method to abort Stream construction to BlobRegistry

BUG=169957

Review URL: https://chromiumcodereview.appspot.com/23490013

git-svn-id: svn://svn.chromium.org/blink/trunk@156904 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Refactoring: Add Event::createBubble.

This reduces usage of bool arguments.

BUG=none
TEST=none; no behavior changes.

Review URL: https://chromiumcodereview.appspot.com/23714003

git-svn-id: svn://svn.chromium.org/blink/trunk@156905 bbb929c8-8fbe-4397-9dbb-9b2b20218538