Revert "Add API for flushing surfaces with gpu semaphores"

This reverts commit 66366c697853e906d961ae691e2bc5209cdcfa62.

Reason for revert: Failing test on mac bots

Original change's description:
> Add API for flushing surfaces with gpu semaphores
> 
> BUG=skia:
> 
> Change-Id: Ia4bfef784cd5f2516ceccafce958be18a86f91d1
> Reviewed-on: https://skia-review.googlesource.com/11488
> Commit-Queue: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Forrest Reiling <freiling@google.com>

TBR=egdaniel@google.com,jvanverth@google.com,bsalomon@google.com,brianosman@google.com,freiling@google.com

Change-Id: I75633a2732d2d48b1926f9ad818a9f1a9196d211
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/20063
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/src/gpu/GrSemaphore.h b/src/gpu/GrSemaphore.h
index f6148b015a..b4843ff780 100644
--- a/src/gpu/GrSemaphore.h
+++ b/src/gpu/GrSemaphore.h
@@ -10,7 +10,6 @@
 
 #include "SkRefCnt.h"
 
-class GrBackendSemaphore;
 class GrGpu;
 
 class GrSemaphore : public SkRefCnt {
@@ -21,15 +20,9 @@ private:
     // GrSemaphore should not be used with its old context.
     void resetGpu(const GrGpu* gpu) { fGpu = gpu; }
 
-    // The derived class will init the GrBackendSemaphore. This is used when flushing with signal
-    // semaphores so we can set the clients GrBackendSemaphore object after we've created the
-    // internal semaphore.
-    virtual void setBackendSemaphore(GrBackendSemaphore*) const = 0;
-
 protected:
     explicit GrSemaphore(const GrGpu* gpu) : fGpu(gpu) {}
 
-    friend class GrRenderTargetContext; // setBackendSemaphore
     friend class GrResourceProvider; // resetGpu
 
     const GrGpu* fGpu;