Remove code that break androidx build.

Bug: 355293776
Test: build
Flag: EXEMPT - test app
Change-Id: Iab5ea3ffaad9c1cd4c9e625707dbb20ae83e72a4

Author: Carlos Martinez Romero

libs/bufferstreams/examples/app/java/com/android/graphics/bufferstreamsdemoapp/BufferDemosAppBar.kt

@@ -1,7 +1,5 @@
 package com.android.graphics.bufferstreamsdemoapp
 
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
@@ -29,10 +27,11 @@ fun BufferDemosAppBar(
             navigationIcon = {
                 if (canNavigateBack) {
                     IconButton(onClick = navigateUp) {
-                        Icon(
-                                imageVector = Icons.AutoMirrored.Filled.ArrowBack,
-                                contentDescription = stringResource(R.string.back_button)
-                        )
+                        // b/355293776
+                        // Icon(
+                        //     imageVector = Icons.AutoMirrored.Filled.ArrowBack,
+                        //     contentDescription = stringResource(R.string.back_button)
+                        // )
                     }
                 }
             }