Update print preview test to not use CallJavascriptFunctionUnsafe

chrome/browser/printing/print_preview_pdf_generated_browsertest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <fstream>
 #include <iostream>
 #include <iterator>
@@ skipping 191 matching lines @@
       // |EndLoop| when an attempt to save the PDF has been made.
       base::Closure end_loop_closure =
           base::Bind(&PrintPreviewObserver::EndLoop, base::Unretained(this));
       GetUI()->SetPdfSavedClosureForTesting(end_loop_closure);
       ASSERT_FALSE(pdf_file_save_path_.empty());
       GetUI()->SetSelectedFileForTesting(pdf_file_save_path_);
       return;
     }
 
     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.
   void SetPrintPreviewSettings(const PrintPreviewSettings& settings) {
     settings_ = base::MakeUnique<PrintPreviewSettings>(settings);
   }
 
   // Returns the setting that could not be set in the preview dialog.
   const std::string& GetFailedSetting() const {
     return failed_setting_;
@@ skipping 52 matching lines @@
     WebContents* web_contents = GetDialog();
     ASSERT_TRUE(web_contents);
     Observe(web_contents);
 
     PrintPreviewUI* ui = GetUI();
     ASSERT_TRUE(ui);
     ASSERT_TRUE(ui->web_ui());
 
     ui->web_ui()->AddMessageHandler(
         base::MakeUnique<UIDoneLoadingMessageHandler>(this));
-    ui->web_ui()->CallJavascriptFunctionUnsafe(
-        "onEnableManipulateSettingsForTest");
+    ui->SendEnableManipulateSettingsForTest();
   }
 
   void DidCloneToNewWebContents(WebContents* old_web_contents,
                                 WebContents* new_web_contents) override {
     Observe(new_web_contents);
   }
 
   Browser* browser_;
   base::Closure quit_closure_;
   std::unique_ptr<PrintPreviewSettings> settings_;
@@ skipping 334 matching lines @@
     // waiting for this message and start waiting for the image data.
     std::cout << "#EOF\n";
     std::cout.flush();
 
     SendPng();
     Reset();
   }
 }
 
 }  // namespace printing