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

Source/core/html/parser/HTMLConstructionSite.cpp

Index: Source/core/html/parser/HTMLConstructionSite.cpp
diff --git a/Source/core/html/parser/HTMLConstructionSite.cpp b/Source/core/html/parser/HTMLConstructionSite.cpp
index 10643a2935c2c7ab26ad2dced342512e773333c2..7d05e81bff4f54ccac243a6374e7e58a0571dff6 100644
--- a/Source/core/html/parser/HTMLConstructionSite.cpp
+++ b/Source/core/html/parser/HTMLConstructionSite.cpp
@@ -325,7 +325,7 @@ void HTMLConstructionSite::setCompatibilityModeFromDoctype(const String& name, c
     // There are three possible compatibility modes:
     // Quirks - quirks mode emulates WinIE and NS4. CSS parsing is also relaxed in this mode, e.g., unit types can
     // be omitted from numbers.
-    // Limited Quirks - This mode is identical to no-quirks mode except for its treatment of line-height in the inline box model.  
+    // Limited Quirks - This mode is identical to no-quirks mode except for its treatment of line-height in the inline box model.
     // No Quirks - no quirks apply. Web pages will obey the specifications to the letter.
 
     // Check for Quirks Mode.