Remove kEnablePrintPreview now that the pdf plugin is part of Chromium.

chrome/browser/printing/print_preview_dialog_controller_browsertest.cc

Index: chrome/browser/printing/print_preview_dialog_controller_browsertest.cc
===================================================================
--- chrome/browser/printing/print_preview_dialog_controller_browsertest.cc	(revision 271915)
+++ chrome/browser/printing/print_preview_dialog_controller_browsertest.cc	(working copy)
@@ -123,12 +123,6 @@
   }
 
  private:
-  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
-#if !defined(GOOGLE_CHROME_BUILD)
-    command_line->AppendSwitch(switches::kEnablePrintPreview);
-#endif
-  }
-
   virtual void SetUpOnMainThread() OVERRIDE {
     WebContents* first_tab =
         browser()->tab_strip_model()->GetActiveWebContents();