Revert of Implement support for using GL ES 3.0 with command buffer

include/gpu/gl/command_buffer/SkCommandBufferGLContext.h

Index: include/gpu/gl/command_buffer/SkCommandBufferGLContext.h
diff --git a/include/gpu/gl/command_buffer/SkCommandBufferGLContext.h b/include/gpu/gl/command_buffer/SkCommandBufferGLContext.h
index cf16c2299c72e32382ca0e624906eb14877d5743..47f3fd967a3b665217864a8d24690452e20751bd 100644
--- a/include/gpu/gl/command_buffer/SkCommandBufferGLContext.h
+++ b/include/gpu/gl/command_buffer/SkCommandBufferGLContext.h
@@ -16,16 +16,8 @@ class SkCommandBufferGLContext : public SkGLContext {
 public:
     ~SkCommandBufferGLContext() override;
 
-    static SkCommandBufferGLContext* CreateES2() {
-        SkCommandBufferGLContext* ctx = new SkCommandBufferGLContext(kGLES2_ContextVersion);
-        if (!ctx->isValid()) {
-            delete ctx;
-            return nullptr;
-        }
-        return ctx;
-    }
-    static SkCommandBufferGLContext* CreateES3() {
-        SkCommandBufferGLContext* ctx = new SkCommandBufferGLContext(kGLES3_ContextVersion);
+    static SkCommandBufferGLContext* Create() {
+        SkCommandBufferGLContext* ctx = new SkCommandBufferGLContext;
         if (!ctx->isValid()) {
             delete ctx;
             return nullptr;
@@ -50,14 +42,10 @@ public:
     int getSampleCount();
 
 private:
-    enum ContextVersion {
-        kGLES2_ContextVersion,
-        kGLES3_ContextVersion
-    };
-    SkCommandBufferGLContext(ContextVersion minContextVersion);
+    SkCommandBufferGLContext();
     SkCommandBufferGLContext(void* nativeWindow, int msaaSampleCount);
-    void initializeGLContext(ContextVersion minContextVersion, void* nativeWindow,
-                             const int* configAttribs, const int* surfaceAttribs);
+    void initializeGLContext(void* nativeWindow, const int* configAttribs,
+                             const int* surfaceAttribs);
     void destroyGLContext();
 
     void onPlatformMakeCurrent() const override;