Don't create renderers for whitespace nodes in flexbox

Source/core/dom/Text.cpp

Index: Source/core/dom/Text.cpp
diff --git a/Source/core/dom/Text.cpp b/Source/core/dom/Text.cpp
index 119d1dc6eb4288b9c2d73b189472cdfceba08c5e..c36409ba691fc60b5f78e09d74a279b3e1249864 100644
--- a/Source/core/dom/Text.cpp
+++ b/Source/core/dom/Text.cpp
@@ -211,7 +211,8 @@ bool Text::textRendererIsNeeded(const NodeRenderingContext& context)
         return true;
 
     RenderObject* parent = context.parentRenderer();
-    if (parent->isTable() || parent->isTableRow() || parent->isTableSection() || parent->isRenderTableCol() || parent->isFrameSet())
+    if (parent->isTable() || parent->isTableRow() || parent->isTableSection() || parent->isRenderTableCol() || parent->isFrameSet()
+        || parent->isFlexibleBox() || parent->isRenderGrid())
         return false;
     
     if (context.style()->preserveNewline()) // pre/pre-wrap/pre-line always make renderers.