Hide RenderBox::isBox() / RenderText::isText()

Hide RenderBox::isBox() / RenderText::isText() to catch useless type checks
at compile time.

R=pdr@chromium.org

Review URL: https://codereview.chromium.org/425503002

git-svn-id: svn://svn.chromium.org/blink/trunk@179037 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/rendering/RenderBox.h

@@ -731,7 +731,8 @@ private:
 
     void invalidatePaintIfNeeded(const PaintInvalidationState&, const RenderLayerModelObject& newPaintInvalidationContainer);
 
-private:
+    bool isBox() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
+
     // The width/height of the contents + borders + padding.  The x/y location is relative to our container (which is not always our parent).
     LayoutRect m_frameRect;
 

third_party/WebKit/Source/core/rendering/RenderText.h

@@ -182,6 +182,8 @@ private:
 
     void secureText(UChar mask);
 
+    bool isText() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
+
     // We put the bitfield first to minimize padding on 64-bit.
     bool m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines.
     bool m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n').

third_party/WebKit/Source/core/rendering/line/TrailingObjects.cpp

@@ -57,7 +57,6 @@ void TrailingObjects::updateMidpointsForTrailingObjects(LineMidpointState& lineM
             currentMidpoint += 2;
         }
     } else if (!lBreak.object()) {
-        ASSERT(m_whitespace->isText());
         ASSERT(collapseFirstSpace == CollapseFirstSpace);
         // Add a new end midpoint that stops right at the very end.
         unsigned length = m_whitespace->textLength();