Replace GR_MAC_BUILD by SK_BUILD_FOR_MAC.

include/gpu/gl/GrGLConfig_chrome.h

Index: include/gpu/gl/GrGLConfig_chrome.h
diff --git a/include/gpu/gl/GrGLConfig_chrome.h b/include/gpu/gl/GrGLConfig_chrome.h
index fe3578339c8b00d0b3bce7aff96e0c7aa4350414..acad90450c11c8b66843bb6743e82a5d04e142df 100644
--- a/include/gpu/gl/GrGLConfig_chrome.h
+++ b/include/gpu/gl/GrGLConfig_chrome.h
@@ -11,14 +11,20 @@
 // glGetError() forces a sync with gpu process on chrome
 #define GR_GL_CHECK_ERROR_START                     0
 
+#if defined(SK_BUILD_FOR_WIN32)
 // ANGLE creates a temp VB for vertex attributes not specified per-vertex.
-#define GR_GL_NO_CONSTANT_ATTRIBUTES                GR_WIN32_BUILD
+#define GR_GL_NO_CONSTANT_ATTRIBUTES                1
 
 // For RGBA teximage/readpixels ANGLE will sw-convert to/from BGRA.
-#define GR_GL_RGBA_8888_PIXEL_OPS_SLOW              GR_WIN32_BUILD
+#define GR_GL_RGBA_8888_PIXEL_OPS_SLOW              1
 
 // ANGLE can go faster if the entire fbo is read rather than a subrect
-#define GR_GL_FULL_READPIXELS_FASTER_THAN_PARTIAL   GR_WIN32_BUILD
+#define GR_GL_FULL_READPIXELS_FASTER_THAN_PARTIAL   1
+#else
+#define GR_GL_NO_CONSTANT_ATTRIBUTES                0
+#define GR_GL_RGBA_8888_PIXEL_OPS_SLOW              0
+#define GR_GL_FULL_READPIXELS_FASTER_THAN_PARTIAL   0
+#endif
 
 // cmd buffer allocates memory and memsets it to zero when it sees glBufferData
 // with NULL.