Update print preview test to not use CallJavascriptFunctionUnsafe

chrome/browser/printing/print_preview_pdf_generated_browsertest.cc

Index: chrome/browser/printing/print_preview_pdf_generated_browsertest.cc
diff --git a/chrome/browser/printing/print_preview_pdf_generated_browsertest.cc b/chrome/browser/printing/print_preview_pdf_generated_browsertest.cc
index 58c1104bd0e9c38b6e44f05ca35d0aa41a910e12..3a47bb1a1a1d5514c29337a3362459d9715f4c39 100644
--- a/chrome/browser/printing/print_preview_pdf_generated_browsertest.cc
+++ b/chrome/browser/printing/print_preview_pdf_generated_browsertest.cc
@@ -209,8 +209,7 @@ class PrintPreviewObserver : public WebContentsObserver {
     }
 
     ASSERT_FALSE(script_argument.empty());
-    GetUI()->web_ui()->CallJavascriptFunctionUnsafe(
-        "onManipulateSettingsForTest", script_argument);
+    GetUI()->SendManipulateSettingsForTest(script_argument);
   }
 
   // Saves the print preview settings to be sent to the print preview dialog.
@@ -283,8 +282,7 @@ class PrintPreviewObserver : public WebContentsObserver {
 
     ui->web_ui()->AddMessageHandler(
         base::MakeUnique<UIDoneLoadingMessageHandler>(this));
-    ui->web_ui()->CallJavascriptFunctionUnsafe(
-        "onEnableManipulateSettingsForTest");
+    ui->SendEnableManipulateSettingsForTest();
   }
 
   void DidCloneToNewWebContents(WebContents* old_web_contents,