libgui: Remove IGBC::BufferItem

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

Change-Id: Id1fa56d092188f2cb712768d5d2fc6a9027fb73c
diff --git a/libs/gui/BufferItemConsumer.cpp b/libs/gui/BufferItemConsumer.cpp
index fb978dd..194121f 100644
--- a/libs/gui/BufferItemConsumer.cpp
+++ b/libs/gui/BufferItemConsumer.cpp
@@ -53,7 +53,7 @@
     mConsumer->setConsumerName(name);
 }
 
-status_t BufferItemConsumer::acquireBuffer(BufferQueue::BufferItem *item,
+status_t BufferItemConsumer::acquireBuffer(BufferItem *item,
         nsecs_t presentWhen, bool waitForFence) {
     status_t err;
 
@@ -83,17 +83,6 @@
     return OK;
 }
 
-status_t BufferItemConsumer::acquireBuffer(android::BufferItem* outItem,
-        nsecs_t presentWhen, bool waitForFence) {
-    BufferQueue::BufferItem item;
-    status_t result = acquireBuffer(&item, presentWhen, waitForFence);
-    if (result != NO_ERROR) {
-        return result;
-    }
-    *outItem = item;
-    return NO_ERROR;
-}
-
 status_t BufferItemConsumer::releaseBuffer(const BufferItem &item,
         const sp<Fence>& releaseFence) {
     status_t err;