[Android WebView] Use CUTOFF_ALLOW_NICE_TO_HAVE
NICE_TO_HAVE will pre-render the soon-bin, which is based on both
velocity and distance. Previously, EVERYTHING will also pre-render the
eventually bin. NICE_TO_HAVE is a better fit for the Android WebView
memory management model where we assume a webview will not go berserk
with memory.
Note that this can still fill up on fling.
BUG=
NOTRY=true
Review URL: https://codereview.chromium.org/
25648003
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226442 0039d316-1c4b-4281-b951-d872f2087c98