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/WritePixelsTest.cpp b/tests/WritePixelsTest.cpp
index a16752f..a41e8f4 100644
--- a/tests/WritePixelsTest.cpp
+++ b/tests/WritePixelsTest.cpp
@@ -427,11 +427,10 @@
 
 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(WritePixelsNonTexture_Gpu, reporter, ctxInfo) {
     GrContext* context = ctxInfo.grContext();
-    GrGpu* gpu = context->contextPriv().getGpu();
 
     for (auto& origin : { kTopLeft_GrSurfaceOrigin, kBottomLeft_GrSurfaceOrigin }) {
         for (int sampleCnt : {0, 4}) {
-            GrBackendTexture backendTex = gpu->createTestingOnlyBackendTexture(
+            GrBackendTexture backendTex = context->getGpu()->createTestingOnlyBackendTexture(
                     nullptr, DEV_W, DEV_H, kSkia8888_GrPixelConfig, true, GrMipMapped::kNo);
             SkColorType colorType;
             if (kRGBA_8888_GrPixelConfig == kSkia8888_GrPixelConfig) {
@@ -442,14 +441,14 @@
             sk_sp<SkSurface> surface(SkSurface::MakeFromBackendTextureAsRenderTarget(
                     context, backendTex, origin, sampleCnt, colorType, nullptr, nullptr));
             if (!surface) {
-                gpu->deleteTestingOnlyBackendTexture(&backendTex);
+                context->getGpu()->deleteTestingOnlyBackendTexture(&backendTex);
                 continue;
             }
 
             test_write_pixels(reporter, surface.get());
 
             surface.reset();
-            gpu->deleteTestingOnlyBackendTexture(&backendTex);
+            context->getGpu()->deleteTestingOnlyBackendTexture(&backendTex);
         }
     }
 }