[Line Layout API] Convert some SVG code to line layout API or shim

Classes outside of core/layout/ that need a reference to an InlineBox's
layoutObject must currently use the API-busting shim we've set up to
get a reference to a LineLayoutItem's underlying layoutObject.

Some references can simply be changed to lineLayoutItem() directly, where
the line layout API already provides access to the methods used.

There are no functional changes.

BUG=499321

Review URL: https://codereview.chromium.org/1629643002

Cr-Commit-Position: refs/heads/master@{#371740}

third_party/WebKit/Source/core/layout/svg/SVGTextLayoutEngine.cpp

@@ -259,11 +259,11 @@ void SVGTextLayoutEngine::layoutCharactersInTextBoxes(InlineFlowBox* start)
 
     for (InlineBox* child = start->firstChild(); child; child = child->nextOnLine()) {
         if (child->isSVGInlineTextBox()) {
-            ASSERT(child->layoutObject().isSVGInlineText());
+            ASSERT(child->lineLayoutItem().isSVGInlineText());
             layoutInlineTextBox(toSVGInlineTextBox(child));
         } else {
             // Skip generated content.
-            Node* node = child->layoutObject().node();
+            Node* node = child->lineLayoutItem().node();
             if (!node)
                 continue;
 

third_party/WebKit/Source/core/paint/SVGRootInlineBoxPainter.cpp

@@ -24,7 +24,7 @@ void SVGRootInlineBoxPainter::paint(const PaintInfo& paintInfo, const LayoutPoin
     bool hasSelection = !paintInfo.isPrinting() && m_svgRootInlineBox.selectionState() != SelectionNone;
 
     PaintInfo paintInfoBeforeFiltering(paintInfo);
-    if (hasSelection && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfoBeforeFiltering.context, m_svgRootInlineBox.layoutObject(),
+    if (hasSelection && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfoBeforeFiltering.context, *LineLayoutAPIShim::constLayoutObjectFrom(m_svgRootInlineBox.lineLayoutItem()),
         paintInfoBeforeFiltering.phase, paintOffset)) {
         LayoutObjectDrawingRecorder recorder(paintInfoBeforeFiltering.context, *LineLayoutAPIShim::constLayoutObjectFrom(m_svgRootInlineBox.lineLayoutItem()), paintInfoBeforeFiltering.phase,
             paintInfoBeforeFiltering.cullRect().m_rect, paintOffset);
@@ -36,7 +36,7 @@ void SVGRootInlineBoxPainter::paint(const PaintInfo& paintInfo, const LayoutPoin
         }
     }
 
-    SVGPaintContext paintContext(m_svgRootInlineBox.layoutObject(), paintInfoBeforeFiltering);
+    SVGPaintContext paintContext(*LineLayoutAPIShim::constLayoutObjectFrom(m_svgRootInlineBox.lineLayoutItem()), paintInfoBeforeFiltering);
     if (paintContext.applyClipMaskAndFilterIfNecessary()) {
         for (InlineBox* child = m_svgRootInlineBox.firstChild(); child; child = child->nextOnLine())
             child->paint(paintContext.paintInfo(), paintOffset, 0, 0);