Revert "Further centralize computation of GrSurface VRAM consumption"

This reverts commit ccd3c8937fce4bb28df19533ed043cad209e277d.

Reason for revert: Blocking Chromium roll: https://codereview.chromium.org/2482643002/

Original change's description:
> Further centralize computation of GrSurface VRAM consumption
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4383
> 
> Change-Id: I054b74f2cd15f904f8e05af0fda58d6e8a523eb9
> Reviewed-on: https://skia-review.googlesource.com/4383
> Commit-Queue: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> 

TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=662630

Change-Id: I186db2a41eb2bd789e6f681b3547e32d9ca374cf
Reviewed-on: https://skia-review.googlesource.com/4443
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
diff --git a/src/gpu/gl/GrGLRenderTarget.cpp b/src/gpu/gl/GrGLRenderTarget.cpp
index 5af5e67..2f92e0a 100644
--- a/src/gpu/gl/GrGLRenderTarget.cpp
+++ b/src/gpu/gl/GrGLRenderTarget.cpp
@@ -82,7 +82,7 @@
 }
 
 size_t GrGLRenderTarget::onGpuMemorySize() const {
-    return GrSurface::ComputeSize(fDesc, fNumSamplesOwnedPerPixel, false);
+    return GrRenderTarget::ComputeSize(fDesc, fNumSamplesOwnedPerPixel);
 }
 
 bool GrGLRenderTarget::completeStencilAttachment() {
@@ -183,7 +183,7 @@
     // Log any renderbuffer's contribution to memory. We only do this if we own the renderbuffer
     // (have a fMSColorRenderbufferID).
     if (fMSColorRenderbufferID) {
-        size_t size = GrSurface::ComputeSize(fDesc, this->msaaSamples(), false);
+        size_t size = GrRenderTarget::ComputeSize(fDesc, this->msaaSamples());
 
         // Due to this resource having both a texture and a renderbuffer component, dump as
         // skia/gpu_resources/resource_#/renderbuffer