Revert accidental Vulkan diagnostic commit.

This reverts commit 59a6758fce.

android/filament-utils-android/src/main/java/com/google/android/filament/utils/ModelViewer.kt

@@ -129,7 +129,7 @@ class ModelViewer(val engine: Engine) : android.view.View.OnTouchListener {
         scene.addEntity(light)
     }
 
-    constructor(surfaceView: SurfaceView, engine: Engine = Engine.create(Engine.Backend.VULKAN), manipulator: Manipulator? = null) : this(engine) {
+    constructor(surfaceView: SurfaceView, engine: Engine = Engine.create(), manipulator: Manipulator? = null) : this(engine) {
         cameraManipulator = manipulator ?: Manipulator.Builder()
                 .targetPosition(kDefaultObjectPosition.x, kDefaultObjectPosition.y, kDefaultObjectPosition.z)
                 .viewport(surfaceView.width, surfaceView.height)

android/samples/sample-gltf-viewer/build.gradle

@@ -29,9 +29,6 @@ android {
         targetSdkVersion versions.targetSdk
         missingDimensionStrategy 'functionality', 'full'
     }
-    sourceSets.main.jniLibs {
-        srcDirs = ["/Users/prideout/Library/Android/sdk/ndk/22.1.7171670/sources/third_party/vulkan/src/build-android/jniLibs"]
-    }
 }
 
 dependencies {

filament/backend/src/vulkan/VulkanConstants.h

@@ -32,7 +32,7 @@
 // }
 //
 #if defined(NDEBUG)
-#define VK_ENABLE_VALIDATION 1
+#define VK_ENABLE_VALIDATION 0
 #else
 #define VK_ENABLE_VALIDATION 1
 #endif

samples/hellopbr.cpp

@@ -52,7 +52,6 @@ int main(int argc, char** argv) {
     Config config;
     config.title = "hellopbr";
     config.iblDirectory = FilamentApp::getRootAssetsPath() + IBL_FOLDER;
-    config.backend = Backend::VULKAN;
 
     App app;
     auto setup = [config, &app](Engine* engine, View* view, Scene* scene) {

samples/hellotriangle.cpp

@@ -65,7 +65,6 @@ static constexpr uint16_t TRIANGLE_INDICES[3] = { 0, 1, 2 };
 int main(int argc, char** argv) {
     Config config;
     config.title = "hellotriangle";
-    config.backend = Engine::Backend::VULKAN;
 
     App app;
     auto setup = [&app](Engine* engine, View* view, Scene* scene) {