Remove GrGpu.h from GrResourceProvider.h

Noticed this while cleaning up GrResourceProvider.h's usage. It seems like a powerful header to just be splashing around.

Change-Id: I686fea61354a7e3c1c759627ffe4a560f7945f83
Reviewed-on: https://skia-review.googlesource.com/20040
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/tests/ImageFilterCacheTest.cpp b/tests/ImageFilterCacheTest.cpp
index 2334172..7088570 100644
--- a/tests/ImageFilterCacheTest.cpp
+++ b/tests/ImageFilterCacheTest.cpp
@@ -181,8 +181,10 @@
 #include "GrContext.h"
 #include "GrContextPriv.h"
 #include "GrResourceProvider.h"
+#include "GrSurfaceProxyPriv.h"
 #include "GrTest.h"
 #include "GrTexture.h"
+#include "GrTextureProxy.h"
 
 static sk_sp<GrTextureProxy> create_proxy(GrResourceProvider* resourceProvider) {
     SkBitmap srcBM = create_bm();