When holding command and moving/scrolling over folders on bookmark folder menu, don't "open all".
When holding command and moving/scrolling over folders on bookmark folder menu, don't "open all".

BUG=http://crbug.com/52488
TEST=
1) Confirm command-click on a folder still does OpenAllInNewTab.
2) Open a folder than has subfolders with bookmarks in them.  
  Hold command and move mouse slowly across the folder.
  Make sure an "open all" is NOT triggered.

Review URL: http://codereview.chromium.org/3329021

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@59110 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser