Bug 1059165 - Part 1 - Always sync visibility for touch caret. r=ehsan

We should sync touch caret's visibility with caret every time since
touch caret might be hidden due to timeout while caret is enabled. Also
remove dead code.

layout/base/nsPresShell.cpp

@@ -2224,20 +2224,17 @@ NS_IMETHODIMP PresShell::SetCaretEnabled(bool aInEnable)
 
   if (mCaretEnabled != oldEnabled)
   {
-/*  Don't change the caret's selection here! This was an evil side-effect of SetCaretEnabled()
-    nsCOMPtr<nsIDOMSelection> domSel;
-    if (NS_SUCCEEDED(GetSelection(nsISelectionController::SELECTION_NORMAL, getter_AddRefs(domSel))) && domSel)
-      mCaret->SetCaretDOMSelection(domSel);
-*/
-
-    MOZ_ASSERT(mCaret || mTouchCaret);
+    MOZ_ASSERT(mCaret);
     if (mCaret) {
       mCaret->SetVisible(mCaretEnabled);
     }
+  }
+
+  // We should sync touch caret's visibility with caret every time since touch
+  // caret might be hidden due to timeout while caret is enabled.
   if (mTouchCaret) {
     mTouchCaret->SyncVisibilityWithCaret();
   }
-  }
 
   return NS_OK;
 }