remove kA1_Config, as it is no longer supported

src/core/SkBlitter_A1.cpp

Index: src/core/SkBlitter_A1.cpp
diff --git a/src/core/SkBlitter_A1.cpp b/src/core/SkBlitter_A1.cpp
deleted file mode 100644
index b64afe2ae98e037eefd73c8305d79866528ae74f..0000000000000000000000000000000000000000
--- a/src/core/SkBlitter_A1.cpp
+++ /dev/null
@@ -1,50 +0,0 @@
-
-/*
- * Copyright 2006 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-
-#include "SkCoreBlitters.h"
-
-SkA1_Blitter::SkA1_Blitter(const SkBitmap& device, const SkPaint& paint)
-        : INHERITED(device) {
-    fSrcA = paint.getAlpha();
-}
-
-void SkA1_Blitter::blitH(int x, int y, int width) {
-    SkASSERT(x >= 0 && y >= 0 &&
-             (unsigned)(x + width) <= (unsigned)fDevice.width());
-
-    if (fSrcA <= 0x7F) {
-        return;
-    }
-    uint8_t* dst = fDevice.getAddr1(x, y);
-    int right = x + width;
-
-    int left_mask = 0xFF >> (x & 7);
-    int rite_mask = 0xFF << (8 - (right & 7));
-    int full_runs = (right >> 3) - ((x + 7) >> 3);
-
-    // check for empty right mask, so we don't read off the end
-    // (or go slower than we need to)
-    if (rite_mask == 0) {
-        SkASSERT(full_runs >= 0);
-        full_runs -= 1;
-        rite_mask = 0xFF;
-    }
-    if (left_mask == 0xFF) {
-        full_runs -= 1;
-    }
-    if (full_runs < 0) {
-        SkASSERT((left_mask & rite_mask) != 0);
-        *dst |= (left_mask & rite_mask);
-    } else {
-        *dst++ |= left_mask;
-        memset(dst, 0xFF, full_runs);
-        dst += full_runs;
-        *dst |= rite_mask;
-    }
-}