Resolve issues with GlueSerializeTest.BackwardsCompatibleTest by appending the new documentSequenceNumber entry to the end of the pickle.
Resolve issues with GlueSerializeTest.BackwardsCompatibleTest by
appending the new documentSequenceNumber entry to the end of the
pickle.

This test forges kVersion, but the function to serialize a
WebHistoryItem does not take the current value of kVersion
into account.  It did not do so before, so instead of trying
to make it do so now, I just chose to append the new field.

TBR=sky

Review URL: http://codereview.chromium.org/556057

git-svn-id: http://src.chromium.org/svn/trunk/src@37391 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: b04adcce5e4a44adff4b8fa7c1c6f4ad22fc9af4
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser