Revert of Import functionality for new GL backend

src/gpu/gl/GrGLCaps.h

Index: src/gpu/gl/GrGLCaps.h
diff --git a/src/gpu/gl/GrGLCaps.h b/src/gpu/gl/GrGLCaps.h
index 8bd9f5c6705308526d5c2bd2111f8da4da95ba26..e924c60efb945796be098d138ec8fcede51b897c 100644
--- a/src/gpu/gl/GrGLCaps.h
+++ b/src/gpu/gl/GrGLCaps.h
@@ -220,15 +220,6 @@
 
     /// Is there support for Vertex Array Objects?
     bool vertexArrayObjectSupport() const { return fVertexArrayObjectSupport; }
-
-    /// Is there support for glDraw*Instanced and glVertexAttribDivisor?
-    bool instancedDrawingSupport() const { return fInstancedDrawingSupport; }
-
-    /// Is there support for GL_EXT_direct_state_access?
-    bool directStateAccessSupport() const { return fDirectStateAccessSupport; }
-
-    /// Is there support for GL_KHR_debug?
-    bool debugSupport() const { return fDebugSupport; }
 
     /// Is there support for ES2 compatability?
     bool ES2CompatibilitySupport() const { return fES2CompatibilitySupport; }
@@ -353,9 +344,6 @@
     bool fTwoFormatLimit : 1;
     bool fFragCoordsConventionSupport : 1;
     bool fVertexArrayObjectSupport : 1;
-    bool fInstancedDrawingSupport : 1;
-    bool fDirectStateAccessSupport : 1;
-    bool fDebugSupport : 1;
     bool fES2CompatibilitySupport : 1;
     bool fMultisampleDisableSupport : 1;
     bool fUseNonVBOVertexAndIndexDynamicData : 1;
@@ -412,8 +400,6 @@
 
     bool fbFetchNeedsCustomOutput() const { return fFBFetchNeedsCustomOutput; }
 
-    bool bindlessTextureSupport() const { return fBindlessTextureSupport; }
-
     const char* fbFetchColorName() const { return fFBFetchColorName; }
 
     const char* fbFetchExtensionString() const { return fFBFetchExtensionString; }
@@ -450,7 +436,6 @@
     bool fDropsTileOnZeroDivide : 1;
     bool fFBFetchSupport : 1;
     bool fFBFetchNeedsCustomOutput : 1;
-    bool fBindlessTextureSupport : 1;
 
     const char* fFBFetchColorName;
     const char* fFBFetchExtensionString;