base/json: Get rid of an old TODO that doesn't apply anymore.
base/json: Get rid of an old TODO that doesn't apply anymore.

The issue seems to be fixed as the ctor of JSONReader is public and there is
a public static Read() function.

BUG=None
TEST=None

R=aa@chromium.org,tony@chromium.org

Review URL: http://codereview.chromium.org/7794003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@98854 0039d316-1c4b-4281-b951-d872f2087c98

ropik/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,ropik/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,gavinp/chromium