remove bzero() define

While attempting to s/SK_BUILD_FOR_WIN32/SK_BUILD_FOR_WIN/g,
I stumbled upon this define for bzero.  Skia doesn't use bzero,
and there's no good reason for skia/ext to use it either.

Change-Id: I12cbc5d40c17491fe1d648540655fad156196549
Reviewed-on: https://chromium-review.googlesource.com/884007Reviewed-by: Mike Reed <reed@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531916}

skia/config/SkUserConfig.h

@@ -138,14 +138,7 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #define SK_B32_SHIFT    0
 #endif
 
-#if defined(SK_BUILD_FOR_WIN32)
-
-#define SK_BUILD_FOR_WIN
-
-// Skia uses this deprecated bzero function to fill zeros into a string.
-#define bzero(str, len) memset(str, 0, len)
-
-#elif defined(SK_BUILD_FOR_MAC)
+#if defined(SK_BUILD_FOR_MAC)
 
 #define SK_CPU_LENDIAN
 #undef  SK_CPU_BENDIAN

skia/ext/raster_handle_allocator_win.cc

@@ -3,8 +3,10 @@
 // found in the LICENSE file.
 
 #include <windows.h>
+
 #include <psapi.h>
 #include <stddef.h>
+#include <string.h>
 
 #include "base/debug/gdi_debug_util_win.h"
 #include "base/memory/ptr_util.h"
@@ -57,7 +59,7 @@ static bool Create(int width,
 
   size_t row_bytes = skia::PlatformCanvasStrideForWidth(width);
   if (do_clear)
-    bzero(pixels, row_bytes * height);
+    memset(pixels, 0, row_bytes * height);
 
   HDC hdc = CreateCompatibleDC(nullptr);
   if (!hdc) {