Task Manager:  Right click on the task manager list box when no item is selected should display column selection menu. But when any item is selected, the table context menu is displayed.
Task Manager:  Right click on the task manager list box when no item is selected should display column selection menu. But when any item is selected, the table context menu is displayed.

BUG=103649
TEST=None


Review URL: http://codereview.chromium.org/8510045

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@110046 0039d316-1c4b-4281-b951-d872f2087c98

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