Remove backend factories

BUG=skia:

Review URL: https://codereview.chromium.org/778453002
diff --git a/src/gpu/gl/GrGLProgramDesc.cpp b/src/gpu/gl/GrGLProgramDesc.cpp
index 474f702..6867a13 100644
--- a/src/gpu/gl/GrGLProgramDesc.cpp
+++ b/src/gpu/gl/GrGLProgramDesc.cpp
@@ -7,7 +7,6 @@
 #include "GrGLProgramDesc.h"
 
 #include "GrGLProcessor.h"
-#include "GrBackendProcessorFactory.h"
 #include "GrProcessor.h"
 #include "GrGpuGL.h"
 #include "GrOptDrawState.h"
@@ -125,7 +124,7 @@
                          GrProcessorKeyBuilder* b) {
     size_t processorKeySize = b->size();
     uint32_t textureKey = gen_texture_key(proc, caps);
-    uint32_t classID = proc.getFactory().classID();
+    uint32_t classID = proc.classID();
 
     // Currently we allow 16 bits for each of the above portions of the meta-key. Fail if they
     // don't fit.
@@ -167,8 +166,7 @@
     if (optState.hasGeometryProcessor()) {
         const GrGeometryProcessor& gp = *optState.getGeometryProcessor();
         GrProcessorKeyBuilder b(&desc->fKey);
-        const GrBackendGeometryProcessorFactory& factory = gp.getFactory();
-        factory.getGLProcessorKey(gp, optState.getBatchTracker(), gpu->glCaps(), &b);
+        gp.getGLProcessorKey(optState.getBatchTracker(), gpu->glCaps(), &b);
         if (!get_meta_key(gp, gpu->glCaps(), 0, gen_attrib_key(gp), &b)) {
             desc->fKey.reset();
             return false;
@@ -179,8 +177,7 @@
         const GrPendingFragmentStage& fps = optState.getFragmentStage(s);
         const GrFragmentProcessor& fp = *fps.getProcessor();
         GrProcessorKeyBuilder b(&desc->fKey);
-        const GrBackendFragmentProcessorFactory& factory = fp.getFactory();
-        factory.getGLProcessorKey(fp, gpu->glCaps(), &b);
+        fp.getGLProcessorKey(gpu->glCaps(), &b);
         if (!get_meta_key(*fps.getProcessor(), gpu->glCaps(),
                          gen_transform_key(fps, requiresLocalCoordAttrib), 0, &b)) {
             desc->fKey.reset();