update to accommodate latest clang in chrome toolchain

remove asserts for null pointers to references
change var args signature to pointer instead of array

R=mtklein@google.com, reed@android.com, reed@google.com, mtklein, reed

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/577243002
diff --git a/src/views/SkTextBox.cpp b/src/views/SkTextBox.cpp
index b0a42cd..55d75a6 100644
--- a/src/views/SkTextBox.cpp
+++ b/src/views/SkTextBox.cpp
@@ -167,7 +167,7 @@
 
 void SkTextBox::draw(SkCanvas* canvas, const char text[], size_t len, const SkPaint& paint)
 {
-    SkASSERT(canvas && &paint && (text || len == 0));
+    SkASSERT(canvas && (text || len == 0));
 
     SkScalar marginWidth = fBox.width();