history: Avoid a temp variable on QueryParser::ParseQueryImpl().
history: Avoid a temp variable on QueryParser::ParseQueryImpl().

While I'm here:
- Remove unneeded includes.
- And an extra blank line.

BUG=None
TEST=None

R=sky@chromium.org

Review URL: http://codereview.chromium.org/6953017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@84618 0039d316-1c4b-4281-b951-d872f2087c98

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