Replace ASSERT with DCHECK in Nullable

third_party/WebKit/Source/bindings/core/v8/Nullable.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef Nullable_h
 #define Nullable_h
 
 #include "platform/heap/Handle.h"
 #include "platform/wtf/Assertions.h"
 
@@ skipping 34 matching lines @@
     value_ = value;
     is_null_ = false;
   }
 
   void Set(std::nullptr_t) {
     value_ = T();
     is_null_ = true;
   }
 
   const T& Get() const {
-    ASSERT(!is_null_);
+    DCHECK(!is_null_);
     return value_;
   }
   T& Get() {
-    ASSERT(!is_null_);
+    DCHECK(!is_null_);
     return value_;
   }
   bool IsNull() const { return is_null_; }
 
   explicit operator bool() const { return !is_null_; }
 
   bool operator==(const Nullable& other) const {
     return (is_null_ && other.is_null_) ||
            (!is_null_ && !other.is_null_ && value_ == other.value_);
   }
 
   DEFINE_INLINE_TRACE() { TraceIfNeeded<T>::Trace(visitor, value_); }
 
  private:
   T value_;
   bool is_null_;
 };
 
 }  // namespace blink
 
 #endif  // Nullable_h