Print Preview tests: Remove unnecessary C++ class definition

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index fb172ef09d746a86f4378f149bdbf2b86b1cd22c..26e4459f65e6a90c987390d993f6f89cb62ab533 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -1776,8 +1776,6 @@ test("browser_tests") {
       "data/webui/history_ui_browsertest.h",
       "data/webui/ntp4_browsertest.cc",
       "data/webui/ntp4_browsertest.h",
-      "data/webui/print_preview.cc",
-      "data/webui/print_preview.h",
       "data/webui/webui_resource_browsertest.cc",
       "gpu/webgl_infobar_browsertest.cc",
       "ppapi/ppapi_browsertest.cc",
@@ -2563,8 +2561,6 @@ test("browser_tests") {
         "../browser/printing/print_preview_pdf_generated_browsertest.cc",
         "../browser/service_process/service_process_control_browsertest.cc",
         "../browser/ui/webui/print_preview/print_preview_ui_browsertest.cc",
-        "data/webui/print_preview.cc",
-        "data/webui/print_preview.h",
       ]
     }
     if (!enable_print_preview || is_mac || is_chromeos) {