remove experimental treat-skcolor-as-srgb flag

tools/skiaserve/urlhandlers/UrlHandler.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColor.h"
 
 struct MHD_Connection;
@@ skipping 124 matching lines @@
  * /colorMode/2 turns on FP16.
  */
 class ColorModeHandler : public UrlHandler {
 public:
     bool canHandle(const char* method, const char* url) override;
     int handle(Request* request, MHD_Connection* connection,
                const char* url, const char* method,
                const char* upload_data, size_t* upload_data_size) override;
 };
 
-/**
- * Controls the global sRGB flag (is SkColor treated as sRGB or not).
- * Posting to /srgbMode/0 causes SkColor to be linear, /colorMode/1
- * causes SkColor to be sRGB;
- */
-class SRGBModeHandler : public UrlHandler {
-public:
-    bool canHandle(const char* method, const char* url) override;
-    int handle(Request* request, MHD_Connection* connection,
-               const char* url, const char* method,
-               const char* upload_data, size_t* upload_data_size) override;
-};
-
 class QuitHandler : public UrlHandler {
 public:
     bool canHandle(const char* method, const char* url) override;
     int handle(Request* request, MHD_Connection* connection,
                const char* url, const char* method,
                const char* upload_data, size_t* upload_data_size) override;
 };