cc: Remove unnecessary "default" cases from switch statements.

cc/layers/picture_layer_impl.cc

Index: cc/layers/picture_layer_impl.cc
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc
index 8b7ed9c19de9bd5d3f72bfc28d3fc5ec39f6457c..08e54ff80a52b5f7f2996aa9903b1a71e243e9c3 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -227,6 +227,7 @@ void PictureLayerImpl::AppendQuads(QuadSink* quad_sink,
 
     const ManagedTileState::TileVersion& tile_version =
         iter->GetTileVersionForDrawing();
+    scoped_ptr<DrawQuad> draw_quad;
     switch (tile_version.mode()) {
       case ManagedTileState::TileVersion::RESOURCE_MODE: {
         gfx::RectF texture_rect = iter.texture_rect();
@@ -244,7 +245,7 @@ void PictureLayerImpl::AppendQuads(QuadSink* quad_sink,
                      texture_rect,
                      iter.texture_size(),
                      tile_version.contents_swizzled());
-        quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
+        draw_quad = quad.PassAs<DrawQuad>();
         break;
       }
       case ManagedTileState::TileVersion::PICTURE_PILE_MODE: {
@@ -267,7 +268,7 @@ void PictureLayerImpl::AppendQuads(QuadSink* quad_sink,
                      iter->contents_scale(),
                      draw_direct_to_backbuffer,
                      pile_);
-        quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
+        draw_quad = quad.PassAs<DrawQuad>();
         break;
       }
       case ManagedTileState::TileVersion::SOLID_COLOR_MODE: {
@@ -276,13 +277,14 @@ void PictureLayerImpl::AppendQuads(QuadSink* quad_sink,
                      geometry_rect,
                      tile_version.get_solid_color(),
                      false);
-        quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
+        draw_quad = quad.PassAs<DrawQuad>();
         break;
       }
-      default:
-        NOTREACHED();
     }
 
+    DCHECK(draw_quad);
+    quad_sink->Append(draw_quad.Pass(), append_quads_data);
+
     if (!seen_tilings.size() || seen_tilings.back() != iter.CurrentTiling())
       seen_tilings.push_back(iter.CurrentTiling());
   }