Revert of Add tokens and entry points for KHR_blend_equation_advanced

src/gpu/gl/GrGLAssembleInterface.cpp

Index: src/gpu/gl/GrGLAssembleInterface.cpp
diff --git a/src/gpu/gl/GrGLAssembleInterface.cpp b/src/gpu/gl/GrGLAssembleInterface.cpp
index 89b21fdec3567169f6d93c73ebb75329d5cc0501..b0f0430ffb3e20bca1e0cbbe945fa8556f501499 100644
--- a/src/gpu/gl/GrGLAssembleInterface.cpp
+++ b/src/gpu/gl/GrGLAssembleInterface.cpp
@@ -70,28 +70,14 @@
     }
     GET_PROC(BeginQuery);
     GET_PROC(BindTexture);
-
-    if (extensions.has("GL_KHR_blend_equation_advanced")) {
-        GET_PROC_SUFFIX(BlendBarrier, KHR);
-    } else if (extensions.has("GL_NV_blend_equation_advanced")) {
-        GET_PROC_SUFFIX(BlendBarrier, NV);
-    }
+    GET_PROC(BlendFunc);
 
     if (glVer >= GR_GL_VER(1,4) ||
-        extensions.has("GL_ARB_imaging")) {
+        extensions.has("GL_ARB_imaging") ||
+        extensions.has("GL_EXT_blend_color")) {
         GET_PROC(BlendColor);
-    } else if (extensions.has("GL_EXT_blend_color")) {
-        GET_PROC_SUFFIX(BlendColor, EXT);
-    }
-
-    if (glVer >= GR_GL_VER(1,4) ||
-        extensions.has("GL_ARB_imaging")) {
-        GET_PROC(BlendEquation);
-    } else if (extensions.has("GL_EXT_blend_subtract")) {
-        GET_PROC_SUFFIX(BlendEquation, EXT);
-    }
-
-    GET_PROC(BlendFunc);
+    }
+
     GET_PROC(BufferData);
     GET_PROC(BufferSubData);
     GET_PROC(Clear);
@@ -355,15 +341,7 @@
     GET_PROC(BindBuffer);
     GET_PROC(BindTexture);
     GET_PROC_SUFFIX(BindVertexArray, OES);
-
-    if (extensions.has("GL_KHR_blend_equation_advanced")) {
-        GET_PROC_SUFFIX(BlendBarrier, KHR);
-    } else if (extensions.has("GL_NV_blend_equation_advanced")) {
-        GET_PROC_SUFFIX(BlendBarrier, NV);
-    }
-
     GET_PROC(BlendColor);
-    GET_PROC(BlendEquation);
     GET_PROC(BlendFunc);
     GET_PROC(BufferData);
     GET_PROC(BufferSubData);