Remove WebCompositorSupport

sky/engine/platform/graphics/Canvas2DLayerBridge.cpp

Index: sky/engine/platform/graphics/Canvas2DLayerBridge.cpp
diff --git a/sky/engine/platform/graphics/Canvas2DLayerBridge.cpp b/sky/engine/platform/graphics/Canvas2DLayerBridge.cpp
index f337d98bc735c28f0a1b73bd8cf27a6e3f7bf0c7..3db540f25a190610379e67cc73dc1a3d6019c082 100644
--- a/sky/engine/platform/graphics/Canvas2DLayerBridge.cpp
+++ b/sky/engine/platform/graphics/Canvas2DLayerBridge.cpp
@@ -31,7 +31,6 @@
 #include "sky/engine/platform/graphics/Canvas2DLayerManager.h"
 #include "sky/engine/platform/graphics/ImageBuffer.h"
 #include "sky/engine/public/platform/Platform.h"
-#include "sky/engine/public/platform/WebCompositorSupport.h"
 #include "sky/engine/public/platform/WebGraphicsContext3D.h"
 #include "sky/engine/public/platform/WebGraphicsContext3DProvider.h"
 #include "sky/engine/wtf/RefCountedLeakCounter.h"
@@ -98,7 +97,8 @@ Canvas2DLayerBridge::Canvas2DLayerBridge(PassOwnPtr<WebGraphicsContext3DProvider
     ASSERT(m_contextProvider);
     // Used by browser tests to detect the use of a Canvas2DLayerBridge.
     TRACE_EVENT_INSTANT0("test_gpu", "Canvas2DLayerBridgeCreation", TRACE_EVENT_SCOPE_NAME_PROCESS);
-    m_layer = adoptPtr(Platform::current()->compositorSupport()->createExternalTextureLayer(this));
+    m_layer = nullptr;
+    CRASH(); // No compositor.
     m_layer->setOpaque(opacityMode == Opaque);
     m_layer->setBlendBackgroundColor(opacityMode != Opaque);
     m_layer->setRateLimitContext(m_rateLimitingEnabled);