DO NOT MERGE libgui: Remove IGBC::BufferItem

Removes IGraphicBufferConsumer::BufferItem. Depends on the
following changes:
    I187b3a7d05196b6289596afac8fb9a9d4aebff76
    I0ddd38df37500cfd6b21d1e768ed14e39c5cd9fc

Cherry-pick of Id1fa56d092188f2cb712768d5d2fc6a9027fb73c

Change-Id: I3edf0db8fba656fd78e18a5a7f1137f0fb6b237d
diff --git a/libs/gui/GLConsumer.cpp b/libs/gui/GLConsumer.cpp
index d256ae5..96c0841 100644
--- a/libs/gui/GLConsumer.cpp
+++ b/libs/gui/GLConsumer.cpp
@@ -361,17 +361,6 @@
     return NO_ERROR;
 }
 
-status_t GLConsumer::acquireBufferLocked(BufferQueue::BufferItem *outItem,
-        nsecs_t presentWhen) {
-    BufferItem item;
-    status_t result = acquireBufferLocked(&item, presentWhen);
-    if (result != NO_ERROR) {
-        return result;
-    }
-    *outItem = item;
-    return NO_ERROR;
-}
-
 status_t GLConsumer::releaseBufferLocked(int buf,
         sp<GraphicBuffer> graphicBuffer,
         EGLDisplay display, EGLSyncKHR eglFence) {
@@ -385,7 +374,7 @@
     return err;
 }
 
-status_t GLConsumer::updateAndReleaseLocked(const BufferQueue::BufferItem& item)
+status_t GLConsumer::updateAndReleaseLocked(const BufferItem& item)
 {
     status_t err = NO_ERROR;