[Android] Fix NTP bookmark image unit for low resolution device.

makeBookmarkItem() function incorrectly converted image size to dip, but
actually it is already dip, so we don't need the conversion. This caused
16px x 16px icon to be classified as non-standard favicon(or small) on low
resolution(ldpi) devices and as a result, it didn't draw the document background.

BUG=238928

Review URL: https://chromiumcodereview.appspot.com/17257004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@208067 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/ntp_android/ntp_android.js

@@ -707,9 +707,7 @@ cr.define('ntp', function() {
       image.onload = function() {
         var w = image.width;
         var h = image.height;
-        var wDip = w / window.devicePixelRatio;
-        var hDip = h / window.devicePixelRatio;
-        if (Math.floor(wDip) <= 16 || Math.floor(hDip) <= 16) {
+        if (Math.floor(w) <= 16 || Math.floor(h) <= 16) {
           // it's a standard favicon (or at least it's small).
           faviconBox.classList.add('document');
 
@@ -740,13 +738,13 @@ cr.define('ntp', function() {
         } else {
           // It's an html5 icon (or at least it's larger).
           // Rescale it to be no bigger than 64x64 dip.
-          var maxDip = 64; // DIP
-          if (wDip > maxDip || hDip > maxDip) {
-            var scale = (wDip > hDip) ? (maxDip / wDip) : (maxDip / hDip);
-            wDip *= scale;
-            hDip *= scale;
+          var max = 64;
+          if (w > max || h > max) {
+            var scale = (w > h) ? (max / w) : (max / h);
+            w *= scale;
+            h *= scale;
           }
-          faviconIcon.style.backgroundSize = wDip + 'px ' + hDip + 'px';
+          faviconIcon.style.backgroundSize = w + 'px ' + h + 'px';
         }
       };
       faviconBox.appendChild(faviconIcon);