DevTools: goto-line functionality should not change selected uisourcecode

BUG=363597

Review URL: https://codereview.chromium.org/239283002

git-svn-id: svn://svn.chromium.org/blink/trunk@171764 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Clean up methods in ScriptValue

This CL is a preparation for introducing NewScriptState to ScriptValue.

- Remove createNull(). Replace the call sites with an alternative method.
- Remove createBoolean(). Ditto.
- Remove toString(). Ditto.
- Rename getString() to toString().
- Remove isEqual(). This method is unused.
- Rename hasNoValue() to isEmpty().

BUG=357144

Review URL: https://codereview.chromium.org/238783006

git-svn-id: svn://svn.chromium.org/blink/trunk@171765 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove DOMImplementation.createCSSStyleSheet()

Intent to Remove:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/uDjkuGA9gQs/zytnzJ6WryYJ

Without createCSSStyleSheet() it becomes a bit more difficult to create
a CSSStyleSheet which is not reachable from elsewhere, but it's still
possible. Note that the updated tests still do fail, the reason being
explained in ~CSSStyleSheet().

BUG=363561

Review URL: https://codereview.chromium.org/238303004

git-svn-id: svn://svn.chromium.org/blink/trunk@171766 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Suggest cmd-P instead of cmd-O

BUG=363718

Review URL: https://codereview.chromium.org/239883004

git-svn-id: svn://svn.chromium.org/blink/trunk@171767 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove UnsafePersistent from ScriptWrappable and ScriptWrappable clients.

BUG=276323

Review URL: https://codereview.chromium.org/238443007

git-svn-id: svn://svn.chromium.org/blink/trunk@171768 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Fix CPU profile flame chart overview scale on hidpi

Driveby: turn couple static functions into regular methods.

BUG=363969

Review URL: https://codereview.chromium.org/237963013

git-svn-id: svn://svn.chromium.org/blink/trunk@171769 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Added devices panel to drawer in DevTools.

BUG=309879

Review URL: https://codereview.chromium.org/170313005

git-svn-id: svn://svn.chromium.org/blink/trunk@171770 bbb929c8-8fbe-4397-9dbb-9b2b20218538