Replace ASSERT with DCHECK in modules/

third_party/WebKit/Source/modules/canvas2d/CanvasStyle.cpp

Index: third_party/WebKit/Source/modules/canvas2d/CanvasStyle.cpp
diff --git a/third_party/WebKit/Source/modules/canvas2d/CanvasStyle.cpp b/third_party/WebKit/Source/modules/canvas2d/CanvasStyle.cpp
index c0293a7bbd7b70d97686652a60d4738e4d752347..43dfce49fee88e597c78f382d2942c66452a9b79 100644
--- a/third_party/WebKit/Source/modules/canvas2d/CanvasStyle.cpp
+++ b/third_party/WebKit/Source/modules/canvas2d/CanvasStyle.cpp
@@ -99,12 +99,12 @@ CanvasStyle::CanvasStyle(CanvasPattern* pattern)
     : type_(kImagePattern), pattern_(pattern) {}
 
 CanvasStyle* CanvasStyle::CreateFromGradient(CanvasGradient* gradient) {
-  ASSERT(gradient);
+  DCHECK(gradient);
   return new CanvasStyle(gradient);
 }
 
 CanvasStyle* CanvasStyle::CreateFromPattern(CanvasPattern* pattern) {
-  ASSERT(pattern);
+  DCHECK(pattern);
   return new CanvasStyle(pattern);
 }