Revert of Handle null return value for getLastResortFallbackFont (https://codereview.chromium.org/150103014/)

Reason for revert:
Appears to have triggered an ASSERT in org.chromium.android_webview.test.AwSettingsTest#testLayoutAlgorithmWithTwoViews

See androidwebview_instrumentation_tests in this build:

http://build.chromium.org/p/chromium.webkit/builders/Android%20Tests%20%28dbg%29/builds/17264



Original issue's description:
> Handle null return value for getLastResortFallbackFont
> 
> getNonRetainedLastResortFallbackFont can, despite the name which seems
> to suggest otherwise, return 0. Handle this case by bailing out and
> asserting.
> 
> BUG=341628
> R=dglazkov@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=166678

TBR=dglazkov@chromium.org,eseidel@chromium.org,eae@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=341628

Review URL: https://codereview.chromium.org/157723002

git-svn-id: svn://svn.chromium.org/blink/trunk@166727 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: remove references to modules/device_orientation from core

BUG=340221

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=166493

Review URL: https://codereview.chromium.org/150913003

git-svn-id: svn://svn.chromium.org/blink/trunk@166728 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove the check for task events, as they were all flow events

All the MessageLoop::PostTask: were of the category task, and in this test were all flow events (81 counts)
Flow events have been disabled-by-default (crbug/338427), the count became 0 --> removing the check.

BUG=341641

Review URL: https://codereview.chromium.org/133313006

git-svn-id: svn://svn.chromium.org/blink/trunk@166729 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Assert that override sizes are only ever set to non-negative values.

This exposed a bug in RenderBlock::fitBorderToLinesIfNeeded where
we would set the override width to a negative value.
When we adjust the right edge, we need to used the adjusted
left value instead of the unadjusted leftEdge value.

Review URL: https://codereview.chromium.org/130473003

git-svn-id: svn://svn.chromium.org/blink/trunk@166730 bbb929c8-8fbe-4397-9dbb-9b2b20218538