remove experimental treat-skcolor-as-srgb flag

tools/skiaserve/urlhandlers/UrlHandler.h

Index: tools/skiaserve/urlhandlers/UrlHandler.h
diff --git a/tools/skiaserve/urlhandlers/UrlHandler.h b/tools/skiaserve/urlhandlers/UrlHandler.h
index 76547c5348eaa59e89a000d771085076431627ba..2702f480fc8606e871f09da8587bdcdaddc04c59 100644
--- a/tools/skiaserve/urlhandlers/UrlHandler.h
+++ b/tools/skiaserve/urlhandlers/UrlHandler.h
@@ -142,19 +142,6 @@ public:
                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;