Fix crash on Mac by passing an owning window to SelectFile() when loading an unpacked extension from chrome://extensions.
Fix crash on Mac by passing an owning window to SelectFile() when loading
an unpacked extension from chrome://extensions.

BUG=20860
TEST=go to chrome://extensions on Mac, click "Load unpacked extensions...", don't crash
Review URL: http://codereview.chromium.org/171121

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@25253 0039d316-1c4b-4281-b951-d872f2087c98

yitian134/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,adobe/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,ropik/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,adobe/chromium,ropik/chromium