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For example, chrome://newtab#bookmarks becomes
chrome-native://bookmarks. This helps users transition smoothly to the
new NTP: any tabs open to the old NTP when the user updates will start
showing the new NTP. Also: opening a foreign session tab from other
platforms and pressing back until arriving at chrome://newtab will now
show the new NTP.

BUG=354063
NOTRY=true

Review URL: https://codereview.chromium.org/205983005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260218 0039d316-1c4b-4281-b951-d872f2087c98