Use static_assert instead of SK_COMPILE_ASSERT.

Now that static_assert is allowed, there is no need to use a non-
standard compile time assertion

Review URL: https://codereview.chromium.org/1306443004
diff --git a/src/gpu/GrAtlasTextContext.cpp b/src/gpu/GrAtlasTextContext.cpp
index a556128..aa4c51d 100644
--- a/src/gpu/GrAtlasTextContext.cpp
+++ b/src/gpu/GrAtlasTextContext.cpp
@@ -103,8 +103,8 @@
     , fDistanceAdjustTable(SkNEW(DistanceAdjustTable)) {
     // We overallocate vertices in our textblobs based on the assumption that A8 has the greatest
     // vertexStride
-    SK_COMPILE_ASSERT(kGrayTextVASize >= kColorTextVASize && kGrayTextVASize >= kLCDTextVASize,
-                      vertex_attribute_changed);
+    static_assert(kGrayTextVASize >= kColorTextVASize && kGrayTextVASize >= kLCDTextVASize,
+                  "vertex_attribute_changed");
     fCurrStrike = NULL;
     fCache = context->getTextBlobCache();
 }