Replace UnsafePersistent with v8::PersistentValueVector.

(Depends on https://codereview.chromium.org/216973002)

BUG=

Review URL: https://codereview.chromium.org/217193002

git-svn-id: svn://svn.chromium.org/blink/trunk@171264 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[Oilpan]: Moving the FontSelector/FontCacheClient, CSSSegmentedFontFace, and FontFaceCache to the oilpan heap.

Had to add two tests to the OilpanExpectations file since this triggers a change in the order in which scrollbars are layed out.

R=ager@chromium.org, erik.corry@gmail.com, haraken@chromium.org, oilpan-reviews@chromium.org, tkent@chromium.org, vegorov@chromium.org, zerny@chromium.org
BUG=341815

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=171119

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=171236

Review URL: https://codereview.chromium.org/227083006

git-svn-id: svn://svn.chromium.org/blink/trunk@171265 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Mark mhtml/mhtml_in_iframe.html as flaky

BUG=362047
TBR=leviw@chromium.org

Review URL: https://codereview.chromium.org/233093002

git-svn-id: svn://svn.chromium.org/blink/trunk@171266 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[DevTools] Fixed %% self-escape in string formatter.

BUG=342810

Review URL: https://codereview.chromium.org/230863006

git-svn-id: svn://svn.chromium.org/blink/trunk@171267 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Kindle Fire UA strings in remote debugger are out of date

This updates the User Agents to reflect the user agents used by the
Silk web browser on Amazon Kindle Fire devices.

This includes all current Kindle devices for the "Devices" tab,
as well as generic Silk UAs for the User Agent tab.

BUG=353396
NOTRY=true

Review URL: https://codereview.chromium.org/196383028

git-svn-id: svn://svn.chromium.org/blink/trunk@171268 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Mark fast/repaint/block-layout-inline-children-replaced.html as failing on Mac Retina

BUG=362050
TBR=leviw@chromium.org

Review URL: https://codereview.chromium.org/233113002

git-svn-id: svn://svn.chromium.org/blink/trunk@171269 bbb929c8-8fbe-4397-9dbb-9b2b20218538