surfaceflinger: remove BufferLayerConsumer::mUseFenceSync

BufferLayerConsumer::mUseFenceSync is always false.  As a result, we
can remove EGLSyncKHR from EglSlot and PendingRelease.

Test: boots
Change-Id: I0fec2137a6548335303e990232637b2da00fa3c6
diff --git a/services/surfaceflinger/SurfaceFlingerConsumer.cpp b/services/surfaceflinger/SurfaceFlingerConsumer.cpp
index c29dad3..8c42bb6 100644
--- a/services/surfaceflinger/SurfaceFlingerConsumer.cpp
+++ b/services/surfaceflinger/SurfaceFlingerConsumer.cpp
@@ -84,7 +84,7 @@
     // reject buffers which have the wrong size
     int slot = item.mSlot;
     if (rejecter && rejecter->reject(mSlots[slot].mGraphicBuffer, item)) {
-        releaseBufferLocked(slot, mSlots[slot].mGraphicBuffer, EGL_NO_SYNC_KHR);
+        releaseBufferLocked(slot, mSlots[slot].mGraphicBuffer);
         return BUFFER_REJECTED;
     }
 
@@ -212,8 +212,7 @@
     ALOGV("Releasing pending buffer");
     Mutex::Autolock lock(mMutex);
     status_t result = releaseBufferLocked(mPendingRelease.currentTexture,
-            mPendingRelease.graphicBuffer, mPendingRelease.display,
-            mPendingRelease.fence);
+            mPendingRelease.graphicBuffer);
     ALOGE_IF(result < NO_ERROR, "releasePendingBuffer failed: %s (%d)",
             strerror(-result), result);
     mPendingRelease = PendingRelease();