Revert "Move more internal methods from GrContext to GrContextPriv"

This reverts commit f440cecbfdf1910104f36aedd0e963da2ae8b6a8.

Reason for revert: breaking android builds. 

Original change's description:
> Move more internal methods from GrContext to GrContextPriv
> 
> TBR=bsalomon@google.com
> Change-Id: Ia8cf0e0d30451c69bc7a08215aafa6abe6e0ddbe
> Reviewed-on: https://skia-review.googlesource.com/97080
> Commit-Queue: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Greg Daniel <egdaniel@google.com>

TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com

Change-Id: If263f8161f0fbe3fc6ee8f34bb09e237705c3694
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/97200
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/tests/ResourceAllocatorTest.cpp b/tests/ResourceAllocatorTest.cpp
index 121cf86..55a7766 100644
--- a/tests/ResourceAllocatorTest.cpp
+++ b/tests/ResourceAllocatorTest.cpp
@@ -47,17 +47,16 @@
 static sk_sp<GrSurfaceProxy> make_backend(GrContext* context, const ProxyParams& p,
                                           GrBackendTexture* backendTex) {
     GrProxyProvider* proxyProvider = context->contextPriv().proxyProvider();
-    GrGpu* gpu = context->contextPriv().getGpu();
 
-    *backendTex = gpu->createTestingOnlyBackendTexture(nullptr, p.fSize, p.fSize,
-                                                       p.fConfig, false,
-                                                       GrMipMapped::kNo);
+    *backendTex = context->getGpu()->createTestingOnlyBackendTexture(nullptr, p.fSize, p.fSize,
+                                                                     p.fConfig, false,
+                                                                     GrMipMapped::kNo);
 
     return proxyProvider->createWrappedTextureProxy(*backendTex, p.fOrigin);
 }
 
 static void cleanup_backend(GrContext* context, GrBackendTexture* backendTex) {
-    context->contextPriv().getGpu()->deleteTestingOnlyBackendTexture(backendTex);
+    context->getGpu()->deleteTestingOnlyBackendTexture(backendTex);
 }
 
 // Basic test that two proxies with overlapping intervals and compatible descriptors are