:first-letter crashes when only content is <wbr>

Looks like this is a regression from:
https://codereview.chromium.org/26315006

RenderWordBreak is the only way you can have a RenderText
with a String of zero length (that I know of).  Since it's very
uncommon to use <wbr> in the first place, we never ran
across this case in our testing.  This check for length() seems unnecessary
and removing it caused no tests to fail for me.

Removing this length check restores the non-crash behavior from before
levi's fix (which was to fix another different crash).

BUG=345054

Review URL: https://codereview.chromium.org/179443002

git-svn-id: svn://svn.chromium.org/blink/trunk@167895 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: remove timeline glue mode and unbalanced console.time[End] support.

R=loislo@chromium.org

Review URL: https://codereview.chromium.org/179833003

git-svn-id: svn://svn.chromium.org/blink/trunk@167896 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Mark some compositing+animation tests flaky on Mac.

r167865 changed the timing of some events. These tests need to be modified.

NOTRY=true
TBR=haraken
BUG=347086

Review URL: https://codereview.chromium.org/181373002

git-svn-id: svn://svn.chromium.org/blink/trunk@167897 bbb929c8-8fbe-4397-9dbb-9b2b20218538