Fix trailing whitespace in .cpp, .h, and .idl files (ex. Source/core)

Source/wtf/SHA1.h

Index: Source/wtf/SHA1.h
diff --git a/Source/wtf/SHA1.h b/Source/wtf/SHA1.h
index fc73727113ab7f8fcafbbaf3ce90658b23f9ddd3..1cf357cffd531fea6de440f262f15a37d294ef34 100644
--- a/Source/wtf/SHA1.h
+++ b/Source/wtf/SHA1.h
@@ -59,13 +59,13 @@ public:
 
     // computeHash has a side effect of resetting the state of the object.
     void computeHash(Vector<uint8_t, 20>&);
-    
+
     // Get a hex hash from the digest. Pass a limit less than 40 if you want a shorter digest.
     static CString hexDigest(const Vector<uint8_t, 20>&);
-    
+
     // Compute the hex digest directly. Pass a limit less than 40 if you want a shorter digest.
     CString computeHexDigest();
-    
+
 private:
     void finalize();
     void processBlock();