Revert of Make "priv" classes for GrTexure and GrSurface. (patchset #9 id:260001 of https://codereview.chromium.org/596053002/)

Reason for revert:
Breaking the Chrome builds with:

 lib/libcc.so: error: undefined reference to 'GrAutoScratchTexture::detach()'

(http://108.170.220.120:10117/builders/Canary-Chrome-Ubuntu13.10-Ninja-x86_64-DRT/builds/2990/steps/Retry_BuildContentShell_1/logs/stdio)

Original issue's description:
> Make "priv" classes for GrTexure and GrSurface.

R=egdaniel@google.com, joshualitt@google.com, bsalomon@google.com
TBR=bsalomon@google.com, egdaniel@google.com, joshualitt@google.com
NOTREECHECKS=true
NOTRY=true

Author: robertphillips@google.com

Review URL: https://codereview.chromium.org/618733002
diff --git a/src/gpu/GrTextStrike.cpp b/src/gpu/GrTextStrike.cpp
index 8ae10cc..fa97f73 100644
--- a/src/gpu/GrTextStrike.cpp
+++ b/src/gpu/GrTextStrike.cpp
@@ -7,7 +7,6 @@
 
 #include "GrGpu.h"
 #include "GrRectanizer.h"
-#include "GrSurfacePriv.h"
 #include "GrTextStrike.h"
 #include "GrTextStrike_impl.h"
 #include "SkString.h"
@@ -207,7 +206,7 @@
 #else
                 filename.printf("fontcache_%d%d.png", gDumpCount, i);
 #endif
-                texture->surfacePriv().savePixels(filename.c_str());
+                texture->savePixels(filename.c_str());
             }
         }
     }