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

Source/core/fileapi/FileReaderLoader.cpp

Index: Source/core/fileapi/FileReaderLoader.cpp
diff --git a/Source/core/fileapi/FileReaderLoader.cpp b/Source/core/fileapi/FileReaderLoader.cpp
index 5a97eeb6049fb6f1db5baa78986b24d68ad53a6c..1cd33de377f865448b47a8839d3b3e48e173f4b1 100644
--- a/Source/core/fileapi/FileReaderLoader.cpp
+++ b/Source/core/fileapi/FileReaderLoader.cpp
@@ -315,7 +315,7 @@ String FileReaderLoader::stringResult()
     default:
         ASSERT_NOT_REACHED();
     }
-    
+
     return m_stringResult;
 }
 
@@ -327,7 +327,7 @@ void FileReaderLoader::convertToText()
     // Decode the data.
     // The File API spec says that we should use the supplied encoding if it is valid. However, we choose to ignore this
     // requirement in order to be consistent with how WebKit decodes the web content: always has the BOM override the
-    // provided encoding.     
+    // provided encoding.
     // FIXME: consider supporting incremental decoding to improve the perf.
     StringBuilder builder;
     if (!m_decoder)