Timeline: remove redundant header from frame statistics

- rename generatePopupContent.* to generateDetailsContent where appropriate;
- change generateDetailsContentForFrame to use TimelineDetailsContentHelper,
    thus removing redundant header;
- (drive-by) fix frame start time in case frames are built from trace events.

Review URL: https://codereview.chromium.org/341483005

git-svn-id: svn://svn.chromium.org/blink/trunk@176397 bbb929c8-8fbe-4397-9dbb-9b2b20218538
IDL parser: drop AttributeOrOperation and StaticAttribute overrides

Static attributes are now supported by the base IDL parser, so these
overrides are no longer needed.

Followup to:
IDL parser: add StaticAttribute production
https://codereview.chromium.org/333853002/

...and prep for:
IDL parser: align with current Web IDL specification
https://codereview.chromium.org/329853005/

Review URL: https://codereview.chromium.org/336733002

git-svn-id: svn://svn.chromium.org/blink/trunk@176398 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Minor Refactor in RenderFlexbox

This is a minor refactoring which moves the case of calculation
of cross-size of flex line for single line flex-container from
RenderFlexibleBox::repositionLogicalHeightDependentFlexItems
to RenderFlexibleBox::alignFlexLines which is more appropriate
and saves us from doing unnecessary work.  The old code was doing 
align-content for a single line, then reposition 
everything when aligning children.

Review URL: https://codereview.chromium.org/340513004

git-svn-id: svn://svn.chromium.org/blink/trunk@176399 bbb929c8-8fbe-4397-9dbb-9b2b20218538