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/include/core/SkImageInfo.h b/include/core/SkImageInfo.h
index 7b48c3a..0218a74 100644
--- a/include/core/SkImageInfo.h
+++ b/include/core/SkImageInfo.h
@@ -112,8 +112,8 @@
         1,  // kIndex_8
         1,  // kGray_8
     };
-    SK_COMPILE_ASSERT(SK_ARRAY_COUNT(gSize) == (size_t)(kLastEnum_SkColorType + 1),
-                      size_mismatch_with_SkColorType_enum);
+    static_assert(SK_ARRAY_COUNT(gSize) == (size_t)(kLastEnum_SkColorType + 1),
+                  "size_mismatch_with_SkColorType_enum");
 
     SkASSERT((size_t)ct < SK_ARRAY_COUNT(gSize));
     return gSize[ct];