Disable Chrome's print preview in Chrome Frame.

chrome_frame/chrome_frame_automation.cc

Index: chrome_frame/chrome_frame_automation.cc
diff --git a/chrome_frame/chrome_frame_automation.cc b/chrome_frame/chrome_frame_automation.cc
index a816e9a12d2d360246a188ac03891381768f1680..c7f144f4bf326c7aa69c9032683256460ccb8ff0 100644
--- a/chrome_frame/chrome_frame_automation.cc
+++ b/chrome_frame/chrome_frame_automation.cc
@@ -270,6 +270,11 @@ void AutomationProxyCacheEntry::CreateProxy(ChromeFrameLaunchParams* params,
 
     command_line->AppendSwitch(switches::kDisablePopupBlocking);
 
+#if defined(GOOGLE_CHROME_BUILD)
+    // Chrome Frame should use the native print dialog.
+    command_line->AppendSwitch(switches::kDisablePrintPreview);
+#endif
+
     // Disable the "Whoa! Chrome has crashed." dialog, because that isn't very
     // useful for Chrome Frame users.
 #ifndef NDEBUG