Fix crash in ExtensionService::SetIsIncognitoEnabled.
Fix crash in ExtensionService::SetIsIncognitoEnabled.

Make a copy of the extension id from within ExtensionService::SetIsIncognitoEnabled, since the const ref may get wiped out when reloading the extension.

BUG=103762
TEST=no crash when toggling incognito mode for an extension

Review URL: http://codereview.chromium.org/8529001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@109676 0039d316-1c4b-4281-b951-d872f2087c98

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