Replace GR_*_BUILD by their SK_BUILD_FOR_* equivalents.

BUG=None
TEST=None, no functional changes.
R=bsalomon@google.com, robertphillips@google.com

Author: tfarina@chromium.org

Review URL: https://chromiumcodereview.appspot.com/24253009

git-svn-id: http://skia.googlecode.com/svn/trunk@11457 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index e62aa5d..9dfe761 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -1487,7 +1487,7 @@
     // We expect to be at least as fast or faster since it doesn't use an intermediate texture as
     // we do below.
 
-#if !GR_MAC_BUILD
+#if !defined(SK_BUILD_FOR_MAC)
     // At least some drivers on the Mac get confused when glTexImage2D is called on a texture
     // attached to an FBO. The FBO still sees the old image. TODO: determine what OS versions and/or
     // HW is affected.