DevTools: Remove orphaned CSS rules [B]

Source/devtools/front_end/timelinePanel.css:465 bottom-border-visible
https://bugs.webkit.org/show_bug.cgi?id=79484

Source/devtools/front_end/timelinePanel.css:629 memory-category-value
https://codereview.chromium.org/19569004

Source/devtools/front_end/inspectorStyle.css:2159 resources-graph-side
Source/devtools/front_end/timelinePanel.css:408 resources-graph-bar-area
https://bugs.webkit.org/show_bug.cgi?id=45657

Source/devtools/front_end/timelinePanel.css:796 revealable-link
https://codereview.chromium.org/402653002

Source/devtools/front_end/timelinePanel.css:666 timeline-details-view-title
https://codereview.chromium.org/325313006

Source/devtools/front_end/timelinePanel.css:747 timeline-memory-split
https://codereview.chromium.org/139463002

Source/devtools/front_end/timelinePanel.css:338 with-children
https://codereview.chromium.org/246893003

BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/431903006

git-svn-id: svn://svn.chromium.org/blink/trunk@179603 bbb929c8-8fbe-4397-9dbb-9b2b20218538