Revert of Add infastructure for gl_SampleMask

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 62bf71a3a9414d39e894b5b7b06f323e086f614f..2302ef05685ae96a65f6b8ff69020f340bf70cd5 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -551,19 +551,9 @@
                     return "#version 330 compatibility\n";
                 }
             }
-        case k400_GrGLSLGeneration:
-            SkASSERT(kGL_GrGLStandard == standard);
-            if (isCoreProfile) {
-                return "#version 400\n";
-            } else {
-                return "#version 400 compatibility\n";
-            }
         case k310es_GrGLSLGeneration:
             SkASSERT(kGLES_GrGLStandard == standard);
             return "#version 310 es\n";
-        case k320es_GrGLSLGeneration:
-            SkASSERT(kGLES_GrGLStandard == standard);
-            return "#version 320 es\n";
     }
     return "<no version>";
 }
@@ -603,22 +593,6 @@
     }
 
     glslCaps->fBindlessTextureSupport = ctxInfo.hasExtension("GL_NV_bindless_texture");
-
-    if (kGL_GrGLStandard == standard) {
-        glslCaps->fSampleVariablesSupport = ctxInfo.glslGeneration() >= k400_GrGLSLGeneration;
-    } else {
-        if (ctxInfo.glslGeneration() >= k320es_GrGLSLGeneration) {
-            glslCaps->fSampleVariablesSupport = true;
-        } else if (ctxInfo.hasExtension("GL_OES_sample_variables")) {
-            glslCaps->fSampleVariablesSupport = true;
-            glslCaps->fSampleVariablesExtensionString = "GL_OES_sample_variables";
-        }
-    }
-
-    if (glslCaps->fSampleVariablesSupport) {
-        glslCaps->fSampleMaskOverrideCoverageSupport =
-            ctxInfo.hasExtension("GL_NV_sample_mask_override_coverage");
-    }
 
     if (kGL_GrGLStandard == standard) {
         glslCaps->fFlatInterpolationSupport = ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;