getDeviceCapabilities is no longer need, so remove it

include/gpu/SkGpuDevice.h

Index: include/gpu/SkGpuDevice.h
diff --git a/include/gpu/SkGpuDevice.h b/include/gpu/SkGpuDevice.h
index 64bd33f439e8f9cd496529efd05408eb85fdcc4f..94ca8d46d88f381a7605668534c58fbaad1d730e 100644
--- a/include/gpu/SkGpuDevice.h
+++ b/include/gpu/SkGpuDevice.h
@@ -74,9 +74,6 @@ public:
     virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE;
 
     // overrides from SkBaseDevice
-    virtual uint32_t getDeviceCapabilities() SK_OVERRIDE {
-        return 0;
-    }
     virtual int width() const SK_OVERRIDE {
         return NULL == fRenderTarget ? 0 : fRenderTarget->width();
     }