Replace ASSERT_NOT_REACHED with NOTREACHED in platform/

third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp

Index: third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp b/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp
index aad4568c60ffca70a2c55681c72fabf18b4743b2..2677032400b413af9506a8267dc192fb29f239a4 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp
+++ b/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp
@@ -426,7 +426,7 @@ DisplayItem::Type ScrollbarTheme::ButtonPartToDisplayItemType(
     case kForwardButtonEndPart:
       return DisplayItem::kScrollbarForwardButtonEnd;
     default:
-      ASSERT_NOT_REACHED();
+      NOTREACHED();
       return DisplayItem::kScrollbarBackButtonStart;
   }
 }
@@ -439,7 +439,7 @@ DisplayItem::Type ScrollbarTheme::TrackPiecePartToDisplayItemType(
     case kForwardTrackPart:
       return DisplayItem::kScrollbarForwardTrack;
     default:
-      ASSERT_NOT_REACHED();
+      NOTREACHED();
       return DisplayItem::kScrollbarBackTrack;
   }
 }