Index8 is dead, remove guarded code

Needs google3 to be updated before this can land.

Bug: skia:6828
Change-Id: I2c16be13c6937ffa48768cc24f9f980171c824d6
Reviewed-on: https://skia-review.googlesource.com/23940
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/src/core/SkBlitter_Sprite.cpp b/src/core/SkBlitter_Sprite.cpp
index ff7d466..9f34391 100644
--- a/src/core/SkBlitter_Sprite.cpp
+++ b/src/core/SkBlitter_Sprite.cpp
@@ -104,15 +104,6 @@
         , fSrcPtr(nullptr)
     {}
 
-    static bool Supports(const SkPixmap& src) {
-#ifdef SK_SUPPORT_LEGACY_INDEX_8_COLORTYPE
-        // We'd need to add a load_i8 stage.
-        return src.colorType() != kIndex_8_SkColorType;
-#else
-        return true;
-#endif
-    }
-
     void setup(const SkPixmap& dst, int left, int top, const SkPaint& paint) override {
         fDst  = dst;
         fLeft = left;
@@ -198,7 +189,7 @@
     if (!blitter && !dst.colorSpace() && dst.colorType() == kN32_SkColorType) {
         blitter = SkSpriteBlitter::ChooseL32(source, paint, allocator);
     }
-    if (!blitter && SkRasterPipelineSpriteBlitter::Supports(source)) {
+    if (!blitter) {
         blitter = allocator->make<SkRasterPipelineSpriteBlitter>(source, allocator);
     }