Revert of Make SkGLContext lifetime more well-defined (patchset #7 id:120001 of https://codereview.chromium.org/1511773005/ )

Reason for revert:
Broke tests on Android, iOS, Mac and Windows.

Original issue's description:
> Make SkGLContext lifetime more well-defined
>
> Remove refcounting from SkGLContext.
>
> SkGLContext is expected to behave like GrContextFactory would own
> it, as implied by the GrContextFactory function.
>
> If it is refcounted, this does not hold.
>
> Also other use sites, such as in SkOSWindow_win (command buffer gl
> object), confirm the behavior. The object is explicitly owned and
> destroyed, not shared.
>
> Also fixes potential crashes from using GL context of an abandoned
> context.
>
> Also fixes potential crashes in DM/nanobench, if the GrContext lives
> longer than GLContext through internal refing of GrContext.
>
> Moves the non-trivial implementations from GrContextFactory.h to
> .cpp, just for consistency sake.
>
> Changes pathops_unittest.gyp. The pathops_unittest uses
> GrContextFactory, but did not link to its implementation. The reason
> they worked was that the implementation used (constructors, destructors)
> happened to be in the .h file.
>
> This works towards being able to use command buffer and NVPR from
> the SampleApp.
>
> BUG=skia:2992
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1511773005
>
> Committed: https://skia.googlesource.com/skia/+/830e012187f951d49d7e46e196ac8d1e653a25da

TBR=bsalomon@google.com,kkinnunen@nvidia.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:2992

Review URL: https://codereview.chromium.org/1555053003

1 files changed, 4 insertions, 2 deletions

diff --git a/include/gpu/gl/SkGLContext.h b/include/gpu/gl/SkGLContext.h
index 7edfa730aa..3420a47973 100644
--- a/include/gpu/gl/SkGLContext.h
+++ b/include/gpu/gl/SkGLContext.h
@@ -17,9 +17,9 @@
  * This class is intended for Skia's testing needs and not for general
  * use.
  */
-class SK_API SkGLContext : public SkNoncopyable {
+class SK_API SkGLContext : public SkRefCnt {
 public:
-    virtual ~SkGLContext();
+    ~SkGLContext() override;
 
     bool isValid() const { return NULL != gl(); }
 
@@ -106,6 +106,8 @@ private:
     SkAutoTUnref<const GrGLInterface> fGL;
 
     friend class GLFenceSync;  // For onPlatformGetProcAddress.
+
+    typedef SkRefCnt INHERITED;
 };
 
 /** Creates platform-dependent GL context object