Make RenderObject::style() return a const object

Source/core/layout/LayoutThemeChromiumMac.mm

Index: Source/core/layout/LayoutThemeChromiumMac.mm
diff --git a/Source/core/layout/LayoutThemeChromiumMac.mm b/Source/core/layout/LayoutThemeChromiumMac.mm
index 66c6dc4b023da4b58883efbad0695b764c872214..324766534ce05f8bc770bd7b1dba41ce54f55190 100644
--- a/Source/core/layout/LayoutThemeChromiumMac.mm
+++ b/Source/core/layout/LayoutThemeChromiumMac.mm
@@ -585,7 +585,7 @@ void LayoutThemeChromiumMac::updatePressedState(NSCell* cell, const RenderObject
         [cell setHighlighted:pressed];
 }
 
-NSControlSize LayoutThemeChromiumMac::controlSizeForFont(RenderStyle* style) const
+NSControlSize LayoutThemeChromiumMac::controlSizeForFont(const RenderStyle* style) const
 {
     int fontSize = style->fontSize();
     if (fontSize >= 16)
@@ -598,7 +598,7 @@ NSControlSize LayoutThemeChromiumMac::controlSizeForFont(RenderStyle* style) con
 // We don't use controlSizeForFont() for search field decorations because it
 // needs to fit into the search field. The font size will already be modified by
 // setFontFromControlSize() called on the search field.
-static NSControlSize searchFieldControlSizeForFont(RenderStyle* style)
+static NSControlSize searchFieldControlSizeForFont(const RenderStyle* style)
 {
     int fontSize = style->fontSize();
     if (fontSize >= 13)
@@ -625,7 +625,7 @@ void LayoutThemeChromiumMac::setControlSize(NSCell* cell, const IntSize* sizes,
         [cell setControlSize:size];
 }
 
-IntSize LayoutThemeChromiumMac::sizeForFont(RenderStyle* style, const IntSize* sizes) const
+IntSize LayoutThemeChromiumMac::sizeForFont(const RenderStyle* style, const IntSize* sizes) const
 {
     if (style->effectiveZoom() != 1.0f) {
         IntSize result = sizes[controlSizeForFont(style)];
@@ -634,7 +634,7 @@ IntSize LayoutThemeChromiumMac::sizeForFont(RenderStyle* style, const IntSize* s
     return sizes[controlSizeForFont(style)];
 }
 
-IntSize LayoutThemeChromiumMac::sizeForSystemFont(RenderStyle* style, const IntSize* sizes) const
+IntSize LayoutThemeChromiumMac::sizeForSystemFont(const RenderStyle* style, const IntSize* sizes) const
 {
     if (style->effectiveZoom() != 1.0f) {
         IntSize result = sizes[controlSizeForSystemFont(style)];
@@ -672,7 +672,7 @@ void LayoutThemeChromiumMac::setFontFromControlSize(RenderStyle* style, NSContro
         style->font().update(nullptr);
 }
 
-NSControlSize LayoutThemeChromiumMac::controlSizeForSystemFont(RenderStyle* style) const
+NSControlSize LayoutThemeChromiumMac::controlSizeForSystemFont(const RenderStyle* style) const
 {
     float fontSize = style->fontSize();
     float zoomLevel = style->effectiveZoom();
@@ -914,7 +914,7 @@ NSLevelIndicatorStyle LayoutThemeChromiumMac::levelIndicatorStyleFor(ControlPart
 
 NSLevelIndicatorCell* LayoutThemeChromiumMac::levelIndicatorFor(const RenderMeter* renderMeter) const
 {
-    RenderStyle* style = renderMeter->style();
+    const RenderStyle* style = renderMeter->style();
     ASSERT(style->appearance() != NoControlPart);
 
     if (!m_levelIndicator)
@@ -972,7 +972,7 @@ const int* LayoutThemeChromiumMac::progressBarMargins(NSControlSize controlSize)
     return margins[controlSize];
 }
 
-int LayoutThemeChromiumMac::minimumProgressBarHeight(RenderStyle* style) const
+int LayoutThemeChromiumMac::minimumProgressBarHeight(const RenderStyle* style) const
 {
     return sizeForSystemFont(style, progressBarSizes()).height();
 }
@@ -1133,7 +1133,7 @@ const int autofillPopupHorizontalPadding = 4;
 // TexfieldPart appearance here. We want to change only Autofill padding.  In
 // the future, we have to separate Autofill popup window logic from WebKit to
 // Chromium.
-int LayoutThemeChromiumMac::popupInternalPaddingLeft(RenderStyle* style) const
+int LayoutThemeChromiumMac::popupInternalPaddingLeft(const RenderStyle* style) const
 {
     if (style->appearance() == TextFieldPart)
         return autofillPopupHorizontalPadding;
@@ -1145,7 +1145,7 @@ int LayoutThemeChromiumMac::popupInternalPaddingLeft(RenderStyle* style) const
     return 0;
 }
 
-int LayoutThemeChromiumMac::popupInternalPaddingRight(RenderStyle* style) const
+int LayoutThemeChromiumMac::popupInternalPaddingRight(const RenderStyle* style) const
 {
     if (style->appearance() == TextFieldPart)
         return autofillPopupHorizontalPadding;
@@ -1160,7 +1160,7 @@ int LayoutThemeChromiumMac::popupInternalPaddingRight(RenderStyle* style) const
     return 0;
 }
 
-int LayoutThemeChromiumMac::popupInternalPaddingTop(RenderStyle* style) const
+int LayoutThemeChromiumMac::popupInternalPaddingTop(const RenderStyle* style) const
 {
     if (style->appearance() == MenulistPart)
         return popupButtonPadding(controlSizeForFont(style))[ThemeMac::TopMargin] * style->effectiveZoom();
@@ -1169,7 +1169,7 @@ int LayoutThemeChromiumMac::popupInternalPaddingTop(RenderStyle* style) const
     return 0;
 }
 
-int LayoutThemeChromiumMac::popupInternalPaddingBottom(RenderStyle* style) const
+int LayoutThemeChromiumMac::popupInternalPaddingBottom(const RenderStyle* style) const
 {
     if (style->appearance() == MenulistPart)
         return popupButtonPadding(controlSizeForFont(style))[ThemeMac::BottomMargin] * style->effectiveZoom();
@@ -1214,7 +1214,7 @@ const IntSize* LayoutThemeChromiumMac::menuListSizes() const
     return sizes;
 }
 
-int LayoutThemeChromiumMac::minimumMenuListSize(RenderStyle* style) const
+int LayoutThemeChromiumMac::minimumMenuListSize(const RenderStyle* style) const
 {
     return sizeForSystemFont(style, menuListSizes()).width();
 }
@@ -1842,7 +1842,7 @@ bool LayoutThemeChromiumMac::paintMediaToggleClosedCaptionsButton(RenderObject*
     return RenderMediaControls::paintMediaControlsPart(MediaShowClosedCaptionsButton, object, paintInfo, rect);
 }
 
-bool LayoutThemeChromiumMac::shouldUseFallbackTheme(RenderStyle* style) const
+bool LayoutThemeChromiumMac::shouldUseFallbackTheme(const RenderStyle* style) const
 {
     ControlPart part = style->appearance();
     if (part == CheckboxPart || part == RadioPart)