Don't track FB depth attachment in debug GL context

tools/gpu/gl/debug/GrFrameBufferObj.cpp

Index: tools/gpu/gl/debug/GrFrameBufferObj.cpp
diff --git a/tools/gpu/gl/debug/GrFrameBufferObj.cpp b/tools/gpu/gl/debug/GrFrameBufferObj.cpp
index 7dc12acafbc08674a7eb62b90573da42532c56d5..e5c24f9ea9ce30c4a3cb968783f96a703bac73c2 100644
--- a/tools/gpu/gl/debug/GrFrameBufferObj.cpp
+++ b/tools/gpu/gl/debug/GrFrameBufferObj.cpp
@@ -28,25 +28,6 @@ void GrFrameBufferObj::setColor(GrFBBindableObj *buffer) {
     }
 }
 
-void GrFrameBufferObj::setDepth(GrFBBindableObj *buffer) {
-    if (fDepthBuffer) {
-        // automatically break the binding of the old buffer
-        GrAlwaysAssert(fDepthBuffer->getDepthBound(this));
-        fDepthBuffer->resetDepthBound(this);
-
-        GrAlwaysAssert(!fDepthBuffer->getDeleted());
-        fDepthBuffer->unref();
-    }
-    fDepthBuffer = buffer;
-    if (fDepthBuffer) {
-        GrAlwaysAssert(!fDepthBuffer->getDeleted());
-        fDepthBuffer->ref();
-
-        GrAlwaysAssert(!fDepthBuffer->getDepthBound(this));
-        fDepthBuffer->setDepthBound(this);
-    }
-}
-
 void GrFrameBufferObj::setStencil(GrFBBindableObj *buffer) {
     if (fStencilBuffer) {
         // automatically break the binding of the old buffer