Hide the insertion handle when performing a paste

Make behavior uniform with other apps on Android,
where after a paste from an editable field, the
insertion handle is hidden and only the cursor
remains visible.

BUG=395645

Review URL: https://codereview.chromium.org/403343004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284480 0039d316-1c4b-4281-b951-d872f2087c98

content/public/android/java/src/org/chromium/content/browser/SelectActionModeCallback.java

@@ -156,6 +156,7 @@ public class SelectActionModeCallback implements ActionMode.Callback {
             mode.finish();
         } else if (id == R.id.select_action_menu_paste) {
             mActionHandler.paste();
+            mode.finish();
         } else if (id == R.id.select_action_menu_share) {
             mActionHandler.share();
             mode.finish();