hide SkDevice::config()

TBR=robertphilips

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/302253002
diff --git a/src/utils/SkDeferredCanvas.cpp b/src/utils/SkDeferredCanvas.cpp
index 9f444e1..a517472 100644
--- a/src/utils/SkDeferredCanvas.cpp
+++ b/src/utils/SkDeferredCanvas.cpp
@@ -159,7 +159,9 @@
 
     virtual int width() const SK_OVERRIDE;
     virtual int height() const SK_OVERRIDE;
+#ifdef SK_SUPPORT_LEGACY_DEVICE_CONFIG
     virtual SkBitmap::Config config() const SK_OVERRIDE;
+#endif
     virtual bool isOpaque() const SK_OVERRIDE;
     virtual SkImageInfo imageInfo() const SK_OVERRIDE;
 
@@ -435,9 +437,11 @@
     return immediateDevice()->height();
 }
 
+#ifdef SK_SUPPORT_LEGACY_DEVICE_CONFIG
 SkBitmap::Config SkDeferredDevice::config() const {
     return immediateDevice()->config();
 }
+#endif
 
 bool SkDeferredDevice::isOpaque() const {
     return immediateDevice()->isOpaque();
diff --git a/src/utils/SkGatherPixelRefsAndRects.h b/src/utils/SkGatherPixelRefsAndRects.h
index 4e52ba0..24111dd 100644
--- a/src/utils/SkGatherPixelRefsAndRects.h
+++ b/src/utils/SkGatherPixelRefsAndRects.h
@@ -38,9 +38,11 @@
     virtual int width() const SK_OVERRIDE { return fSize.width(); }
     virtual int height() const SK_OVERRIDE { return fSize.height(); }
     virtual bool isOpaque() const SK_OVERRIDE { return false; }
+#ifdef SK_SUPPORT_LEGACY_DEVICE_CONFIG
     virtual SkBitmap::Config config() const SK_OVERRIDE {
         return SkBitmap::kNo_Config;
     }
+#endif
     virtual SkImageInfo imageInfo() const SK_OVERRIDE {
         return fEmptyBitmap.info();
     }
diff --git a/src/utils/SkPictureUtils.cpp b/src/utils/SkPictureUtils.cpp
index 512b228..4dcb855 100644
--- a/src/utils/SkPictureUtils.cpp
+++ b/src/utils/SkPictureUtils.cpp
@@ -61,9 +61,11 @@
     virtual int width() const SK_OVERRIDE { return fSize.width(); }
     virtual int height() const SK_OVERRIDE { return fSize.height(); }
     virtual bool isOpaque() const SK_OVERRIDE { return false; }
+#ifdef SK_SUPPORT_LEGACY_DEVICE_CONFIG
     virtual SkBitmap::Config config() const SK_OVERRIDE {
         return SkBitmap::kNo_Config;
     }
+#endif
     virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }
     virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE {
         return false;