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

Source/core/loader/ThreadableLoader.h

Index: Source/core/loader/ThreadableLoader.h
diff --git a/Source/core/loader/ThreadableLoader.h b/Source/core/loader/ThreadableLoader.h
index b5f5f68aea553c89f062d7502746a604614f54ab..6df1a5ce0a0ffd30d00681897cbf05f9d508c7e6 100644
--- a/Source/core/loader/ThreadableLoader.h
+++ b/Source/core/loader/ThreadableLoader.h
@@ -44,7 +44,7 @@ namespace WebCore {
     class ResourceResponse;
     class ScriptExecutionContext;
     class ThreadableLoaderClient;
-    
+
     enum CrossOriginRequestPolicy {
         DenyCrossOriginRequests,
         UseAccessControl,
@@ -77,7 +77,7 @@ namespace WebCore {
         unsigned long timeoutMilliseconds;
     };
 
-    // Useful for doing loader operations from any thread (not threadsafe, 
+    // Useful for doing loader operations from any thread (not threadsafe,
     // just able to run on threads other than the main thread).
     class ThreadableLoader {
         WTF_MAKE_NONCOPYABLE(ThreadableLoader);