remove (dead) caches from hwui

Test: make

Change-Id: I18bfe51896672272ce7d471eaead69b651399368
diff --git a/libs/hwui/renderstate/RenderState.cpp b/libs/hwui/renderstate/RenderState.cpp
index 5e33353..f173136 100644
--- a/libs/hwui/renderstate/RenderState.cpp
+++ b/libs/hwui/renderstate/RenderState.cpp
@@ -125,10 +125,7 @@
 }
 
 void RenderState::onBitmapDestroyed(uint32_t pixelRefId) {
-    if (mCaches && mCaches->textureCache.destroyTexture(pixelRefId)) {
-        glFlush();
-        GL_CHECKPOINT(MODERATE);
-    }
+    // DEAD CODE
 }
 
 void RenderState::setViewport(GLsizei width, GLsizei height) {