Fix trailing whitespace in .cpp, .h, and .idl files

Source/core/accessibility/AccessibilityTableHeaderContainer.cpp

Index: Source/core/accessibility/AccessibilityTableHeaderContainer.cpp
diff --git a/Source/core/accessibility/AccessibilityTableHeaderContainer.cpp b/Source/core/accessibility/AccessibilityTableHeaderContainer.cpp
index 8af99ff8d1a1f6ff386de8c16d7e131d5a77966b..1a1d97207d5b53edffa6e81ce8760e9ebc62a233 100644
--- a/Source/core/accessibility/AccessibilityTableHeaderContainer.cpp
+++ b/Source/core/accessibility/AccessibilityTableHeaderContainer.cpp
@@ -46,7 +46,7 @@ PassRefPtr<AccessibilityTableHeaderContainer> AccessibilityTableHeaderContainer:
 {
     return adoptRef(new AccessibilityTableHeaderContainer());
 }
-    
+
 LayoutRect AccessibilityTableHeaderContainer::elementRect() const
 {
     // this will be filled in when addChildren is called
@@ -63,14 +63,14 @@ bool AccessibilityTableHeaderContainer::computeAccessibilityIsIgnored() const
 
 void AccessibilityTableHeaderContainer::addChildren()
 {
-    ASSERT(!m_haveChildren); 
-    
+    ASSERT(!m_haveChildren);
+
     m_haveChildren = true;
     if (!m_parent || !m_parent->isAccessibilityTable())
         return;
-    
+
     static_cast<AccessibilityTable*>(m_parent)->columnHeaders(m_children);
-    
+
     unsigned length = m_children.size();
     for (unsigned k = 0; k < length; ++k)
         m_headerRect.unite(m_children[k]->elementRect());