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/include/gui/BufferItem.h b/include/gui/BufferItem.h
index 112c482..cc41bae 100644
--- a/include/gui/BufferItem.h
+++ b/include/gui/BufferItem.h
@@ -20,10 +20,10 @@
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
 
-#include <gui/IGraphicBufferConsumer.h>
-
 #include <ui/Rect.h>
 
+#include <system/graphics.h>
+
 #include <utils/Flattenable.h>
 #include <utils/StrongPointer.h>
 
@@ -44,9 +44,7 @@
     // The default value of mBuf, used to indicate this doesn't correspond to a slot.
     enum { INVALID_BUFFER_SLOT = -1 };
     BufferItem();
-    BufferItem(const IGraphicBufferConsumer::BufferItem& item);
     ~BufferItem();
-    operator IGraphicBufferConsumer::BufferItem() const;
 
     static const char* scalingModeName(uint32_t scalingMode);