Fixing a bug with poping up enlarged image when mouse is out of the thumbnail.

BUG=chromium-os:20552
TEST=None


Review URL: http://codereview.chromium.org/8769043

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112974 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/file_manager/css/file_manager.css

@@ -328,6 +328,7 @@ div.img-container > img {
   background-color: #F2F2F2;
   margin: 0;
   z-index: 1;
+  pointer-events: none;
   position: absolute;
 
   -webkit-transition: all 180ms ease-in;
@@ -340,6 +341,7 @@ div.img-container > img {
 .preview-thumbnails > div:hover > div.popup {
   -webkit-transform: translate(0, 0) scale(1.0);
   opacity: 1;
+  pointer-events: auto;
 }
 
 .preview-panel > * {