Revert of Enable sRGB on iOS, make sRGB decode support optional

include/gpu/GrContextOptions.h

Index: include/gpu/GrContextOptions.h
diff --git a/include/gpu/GrContextOptions.h b/include/gpu/GrContextOptions.h
index 93650238ab067c3ba721055507c3afe0b1faf6e1..0522b9d20bc5110868467c9568f688e5756576bf 100644
--- a/include/gpu/GrContextOptions.h
+++ b/include/gpu/GrContextOptions.h
@@ -82,14 +82,6 @@
      * purposes.
      */
     bool fForceSWPathMasks = false;
-
-    /**
-     * If true, sRGB support will not be enabled unless sRGB decoding can be disabled (via an
-     * extension). If mixed use of "legacy" mode and sRGB/color-correct mode is not required, this
-     * can be set to false, which will significantly expand the number of devices that qualify for
-     * sRGB support.
-     */
-    bool fRequireDecodeDisableForSRGB = true;
 };
 
 #endif