Remove unused private field mVrClient from VrCommandEngine

There is a compile warning: private field 'mVrClient' is not used [-Wunused-private-field]

Bug: None
Test: build

Change-Id: I58d2f1f176727ef293067cbc62da4d971f4fc4e5
diff --git a/services/vr/hardware_composer/Android.bp b/services/vr/hardware_composer/Android.bp
index 003775b..258b45b 100644
--- a/services/vr/hardware_composer/Android.bp
+++ b/services/vr/hardware_composer/Android.bp
@@ -55,7 +55,6 @@
     "-DATRACE_TAG=ATRACE_TAG_GRAPHICS",
     "-Wall",
     "-Werror",
-    // mVrClient unused in vr_composer_client.cpp
     "-Wno-error=unused-private-field",
     // Warnings in vr_hwc.cpp to be fixed after sync of goog/master.
     "-Wno-sign-compare",
diff --git a/services/vr/hardware_composer/impl/vr_composer_client.cpp b/services/vr/hardware_composer/impl/vr_composer_client.cpp
index d775711..786d5fa 100644
--- a/services/vr/hardware_composer/impl/vr_composer_client.cpp
+++ b/services/vr/hardware_composer/impl/vr_composer_client.cpp
@@ -45,7 +45,7 @@
 }
 
 VrComposerClient::VrCommandEngine::VrCommandEngine(VrComposerClient& client)
-    : ComposerCommandEngine(client.mHal, client.mResources.get()), mVrClient(client),
+    : ComposerCommandEngine(client.mHal, client.mResources.get()),
       mVrHal(client.mVrHal) {}
 
 VrComposerClient::VrCommandEngine::~VrCommandEngine() {}
diff --git a/services/vr/hardware_composer/impl/vr_composer_client.h b/services/vr/hardware_composer/impl/vr_composer_client.h
index 76b1c4f..de22640 100644
--- a/services/vr/hardware_composer/impl/vr_composer_client.h
+++ b/services/vr/hardware_composer/impl/vr_composer_client.h
@@ -54,7 +54,6 @@
 
     IVrComposerClient::BufferMetadata readBufferMetadata();
 
-    VrComposerClient& mVrClient;
     android::dvr::VrHwc& mVrHal;
 
     VrCommandEngine(const VrCommandEngine&) = delete;