make chrome build without any printing support

headless/lib/browser/headless_devtools_manager_delegate.cc

 // Copyright 2016 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 "headless/lib/browser/headless_devtools_manager_delegate.h"
 
 #include <string>
 #include <utility>
 
 #include "content/public/browser/browser_thread.h"
@@ skipping 10 matching lines @@
 
 namespace headless {
 
 namespace {
 const char kIdParam[] = "id";
 const char kResultParam[] = "result";
 const char kErrorParam[] = "error";
 const char kErrorCodeParam[] = "code";
 const char kErrorMessageParam[] = "message";
 
-// The max and min value should match the ones in scaling_settings.html.
-// Update both files at the same time.
-const double kScaleMaxVal = 200;
-const double kScaleMinVal = 10;
-
 // JSON RPC 2.0 spec: http://www.jsonrpc.org/specification#error_object
 enum Error {
   kErrorInvalidParam = -32602,
   kErrorServerError = -32000
 };
 
 std::unique_ptr<base::DictionaryValue> CreateSuccessResponse(
     int command_id,
     std::unique_ptr<base::Value> result) {
   if (!result)
@@ skipping 43 matching lines @@
         command_id, kErrorServerError,
         printing::HeadlessPrintManager::PrintResultToString(print_result));
   }
   callback.Run(std::move(response));
 }
 #endif
 
 }  // namespace
 
 #if BUILDFLAG(ENABLE_BASIC_PRINTING)
+// The max and min value should match the ones in scaling_settings.html.

[Lei Zhang, 2017/05/17 07:01:24]

Can you create another anonymous namespace for these?

[jzfeng, 2017/05/19 01:33:53]

Done.

+// Update both files at the same time.
+const double kScaleMaxVal = 200;
+const double kScaleMinVal = 10;
+
 std::unique_ptr<base::DictionaryValue> ParsePrintSettings(
     int command_id,
     const base::DictionaryValue* params,
     printing::HeadlessPrintSettings* settings) {
   // We can safely ignore the return values of the following Get methods since
   // the defaults are already set in |settings|.
   params->GetBoolean("landscape", &settings->landscape);
   params->GetBoolean("displayHeaderFooter", &settings->display_header_footer);
   params->GetBoolean("printBackground", &settings->should_print_backgrounds);
   params->GetDouble("scale", &settings->scale);
@@ skipping 261 matching lines @@
 
   std::unique_ptr<base::Value> result(
       target::DisposeBrowserContextResult::Builder()
           .SetSuccess(success)
           .Build()
           ->Serialize());
   return CreateSuccessResponse(command_id, std::move(result));
 }
 
 }  // namespace headless