Make all GrFragmentProcessors GL independent.

TBR=bsalomon@google.com

BUG=skia:

Review URL: https://codereview.chromium.org/1434313002
diff --git a/src/gpu/effects/GrPorterDuffXferProcessor.cpp b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
index 650a1e7..78d0f14 100644
--- a/src/gpu/effects/GrPorterDuffXferProcessor.cpp
+++ b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
@@ -13,8 +13,8 @@
 #include "GrProcOptInfo.h"
 #include "GrTypes.h"
 #include "GrXferProcessor.h"
-#include "gl/GrGLSLBlend.h"
 #include "gl/GrGLXferProcessor.h"
+#include "glsl/GrGLSLBlend.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLProgramBuilder.h"
 #include "glsl/GrGLSLProgramDataManager.h"