Fix Mac PPAPI (out-of-process).
Fix Mac PPAPI (out-of-process).

Oops, we forgot to initialize the WebCore system interface.

TEST=Mac Flapper runs for pages that display text, e.g., YouTube.
BUG=none


Review URL: http://codereview.chromium.org/7818005

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@99136 0039d316-1c4b-4281-b951-d872f2087c98

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