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

Source/core/html/HTMLDocument.cpp

Index: Source/core/html/HTMLDocument.cpp
diff --git a/Source/core/html/HTMLDocument.cpp b/Source/core/html/HTMLDocument.cpp
index 1af0f732a6a79c64e814051835fa55dba9b78a08..33f5417ab7a5ced797ecdfab3abe14c19997701e 100644
--- a/Source/core/html/HTMLDocument.cpp
+++ b/Source/core/html/HTMLDocument.cpp
@@ -244,7 +244,7 @@ void HTMLDocument::addNamedItem(const AtomicString& name)
 }
 
 void HTMLDocument::removeNamedItem(const AtomicString& name)
-{ 
+{
     removeItemFromMap(m_namedItemCounts, name);
 }
 
@@ -254,7 +254,7 @@ void HTMLDocument::addExtraNamedItem(const AtomicString& name)
 }
 
 void HTMLDocument::removeExtraNamedItem(const AtomicString& name)
-{ 
+{
     removeItemFromMap(m_extraNamedItemCounts, name);
 }