SkNonCopyable should be used with private inheritance.

This is mostly s/public SkNoncopyable/SkNoncopyable/g.

Two classes (SkDrawLooper::Context and SkPicture::OperationList) don't actually work with SkNoncopyable because they introduce a virtual destructor.  I added SkNoncopyableVirtual to make them work as intended.  Sort of questionable whether they really need to be noncopyable in the first place, but I guess it doesn't hurt to keep the behavior the same.

BUG=skia:
R=reed@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/226183018

git-svn-id: http://skia.googlecode.com/svn/trunk@14081 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrAllocator.h b/src/gpu/GrAllocator.h
index 4e47fb1..a2ad408 100644
--- a/src/gpu/GrAllocator.h
+++ b/src/gpu/GrAllocator.h
@@ -13,7 +13,7 @@
 #include "SkTArray.h"
 #include "SkTypes.h"
 
-class GrAllocator : public SkNoncopyable {
+class GrAllocator : SkNoncopyable {
 public:
     ~GrAllocator() {
         reset();
@@ -153,7 +153,7 @@
 };
 
 template <typename T>
-class GrTAllocator : public SkNoncopyable {
+class GrTAllocator : SkNoncopyable {
 public:
     virtual ~GrTAllocator() { this->reset(); };