Revert "Have the Surface class track the buffer age."

This reverts commit b4f7493fbdb1d9d5b437a1dcb82e98b1531f4e3e.

Change-Id: I9a783c8e768637bd73ac53a856e5f42703dcd82b
diff --git a/libs/gui/BufferQueueProducer.cpp b/libs/gui/BufferQueueProducer.cpp
index 3424012..3d94a02 100644
--- a/libs/gui/BufferQueueProducer.cpp
+++ b/libs/gui/BufferQueueProducer.cpp
@@ -347,10 +347,10 @@
     return NO_ERROR;
 }
 
-status_t BufferQueueProducer::dequeueBuffer(int* outSlot, sp<android::Fence>* outFence,
-                                            uint32_t width, uint32_t height, PixelFormat format,
-                                            uint64_t usage, uint64_t* outBufferAge,
-                                            FrameEventHistoryDelta* outTimestamps) {
+status_t BufferQueueProducer::dequeueBuffer(int *outSlot,
+        sp<android::Fence> *outFence, uint32_t width, uint32_t height,
+        PixelFormat format, uint64_t usage,
+        FrameEventHistoryDelta* outTimestamps) {
     ATRACE_CALL();
     { // Autolock scope
         Mutex::Autolock lock(mCore->mMutex);
@@ -558,9 +558,6 @@
             mSlots[*outSlot].mFrameNumber,
             mSlots[*outSlot].mGraphicBuffer->handle, returnFlags);
 
-    if (outBufferAge) {
-        *outBufferAge = mCore->mBufferAge;
-    }
     addAndGetFrameTimestamps(nullptr, outTimestamps);
 
     return returnFlags;