Revert of Support GL_SAMPLES queries in null contexts

tools/gpu/gl/debug/GrFBBindableObj.h

Index: tools/gpu/gl/debug/GrFBBindableObj.h
diff --git a/tools/gpu/gl/debug/GrFBBindableObj.h b/tools/gpu/gl/debug/GrFBBindableObj.h
index f5b46ab5d95cc39b3d37dbfdcf47f3224375443f..e2b43a6a1b406fc092a527cbd3eb8d1220de8e7d 100644
--- a/tools/gpu/gl/debug/GrFBBindableObj.h
+++ b/tools/gpu/gl/debug/GrFBBindableObj.h
@@ -18,8 +18,7 @@
 
 public:
     GrFBBindableObj()
-        : GrFakeRefObj()
-        , fNumSamples(1) {
+        : GrFakeRefObj() {
     }
 
     virtual ~GrFBBindableObj() {
@@ -76,11 +75,8 @@
         return 0 != fStencilReferees.count();
     }
 
-    int numSamples() { return fNumSamples; }
 
 protected:
-    int fNumSamples;
-
 private:
     SkTDArray<GrFakeRefObj *> fColorReferees;   // frame buffers that use this as a color buffer (via "glFramebufferRenderbuffer" or "glFramebufferTexture2D")
     SkTDArray<GrFakeRefObj *> fDepthReferees;   // frame buffers that use this as a depth buffer (via "glFramebufferRenderbuffer" or "glFramebufferTexture2D")