Revert 220417 "[temporary M30 fix] Disable dragging tabs with we..."

trunk/src/chrome/browser/ui/views/tabs/tab_strip.cc

Index: trunk/src/chrome/browser/ui/views/tabs/tab_strip.cc
===================================================================
--- trunk/src/chrome/browser/ui/views/tabs/tab_strip.cc	(revision 221832)
+++ trunk/src/chrome/browser/ui/views/tabs/tab_strip.cc	(working copy)
@@ -1127,16 +1127,6 @@
       gfx::Screen::GetScreenFor(widget->GetNativeView())->GetNumDisplays() == 1)
     detach_behavior = TabDragController::NOT_DETACHABLE;
 
-#if defined(OS_CHROMEOS)
-  // TODO(wittman): This is a temporary workaround to avoid crbug.com/275274 and
-  // crbug.com/274856 in M30 and should be reverted after merge, as we have a
-  // solution to these bugs in trunk.
-  //
-  // Don't allow detaching if the tab has a WebContentsModalDialogView opened.
-  if (controller()->IsTabShowingWebViewModalDialog(GetModelIndexOfTab(tab)))
-    detach_behavior = TabDragController::NOT_DETACHABLE;
-#endif
-
 #if defined(OS_WIN)
   // It doesn't make sense to drag tabs out on Win8's single window Metro mode.
   if (win8::IsSingleWindowMetroMode())