Remove TreatNullAs=NullString for URLUtils.href

http://url.spec.whatwg.org/#urlutils

The updated element-attribute-js-null tests pass in Firefox Nightly,
IE11 Release Preview and Opera 12.16.

No other browser passes the URL.href test, because Firefox throws when
setting a non-valid URL, while IE and Opera don't even support the URL
constructor.

BUG=310298

Review URL: https://codereview.chromium.org/105823005

git-svn-id: svn://svn.chromium.org/blink/trunk@163294 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Prevent ASSERTION FAILED !(len & kPageAllocationGranularityOffsetMask) on win.

This can only happen on windows, where kPageAllocationGranularity is 64K. To
ensure this isn't violated, we can't ask for N-1 additonal system pages when
the alignement fails (although that is sufficient from a space perspective to
cover the desired address).  So just ask for N.

This assertion is preventing a webkit roll.
TBR=cevans@chromium.org

Review URL: https://codereview.chromium.org/107133002

git-svn-id: svn://svn.chromium.org/blink/trunk@163295 bbb929c8-8fbe-4397-9dbb-9b2b20218538