Use new PrintViewManagerBase::PrintToPdf method (fixes issue #3377)

libcef/browser/chrome/browser_platform_delegate_chrome.h

@@ -42,6 +42,7 @@ class CefBrowserPlatformDelegateChrome
   void ViewText(const std::string& text) override;
   CefEventHandle GetEventHandle(
       const content::NativeWebKeyboardEvent& event) const override;
+  bool IsPrintPreviewSupported() const override;
 
   // CefBrowserPlatformDelegateNative::WindowlessHandler methods:
   CefWindowHandle GetParentWindowHandle() const override;