Revert of Add support for flattening in GeometryMapper.

third_party/WebKit/Source/platform/graphics/paint/GeometryMapper.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/GeometryMapper.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/GeometryMapper.cpp b/third_party/WebKit/Source/platform/graphics/paint/GeometryMapper.cpp
index 55f018cd203b269f739b2cfb1773f64fbb530436..6258d642b44163697b80df40d37b24c93ed689c8 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/GeometryMapper.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/GeometryMapper.cpp
@@ -373,14 +373,6 @@
        it++) {
     TransformationMatrix localTransformMatrix = (*it)->matrix();
     localTransformMatrix.applyTransformOrigin((*it)->origin());
-
-    // Flattening Lemma: flatten(A * flatten(B)) = flatten(flatten(A) * B).
-    // goo.gl/DNKyOc. Thus we can flatten transformMatrix rather than
-    // localTransformMatrix, because GeometryMapper only supports transforms
-    // into a flattened destination space.
-    if ((*it)->flattensInheritedTransform())
-      transformMatrix.flattenTo2d();
-
     transformMatrix = transformMatrix * localTransformMatrix;
     (*it)->getTransformCache().setCachedTransform(ancestorTransformNode,
                                                   transformMatrix);