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

Source/core/fileapi/FileReader.cpp

Index: Source/core/fileapi/FileReader.cpp
diff --git a/Source/core/fileapi/FileReader.cpp b/Source/core/fileapi/FileReader.cpp
index a6189a78464fac8f2df6f7dc085d7c8d226cf2d2..5535a8b7f6a0818a547252e4eee94a011dd9eddd 100644
--- a/Source/core/fileapi/FileReader.cpp
+++ b/Source/core/fileapi/FileReader.cpp
@@ -236,7 +236,7 @@ void FileReader::didFinishLoading()
     fireEvent(eventNames().progressEvent);
     fireEvent(eventNames().loadEvent);
     fireEvent(eventNames().loadendEvent);
-    
+
     // All possible events have fired and we're done, no more pending activity.
     unsetPendingActivity(this);
 }
@@ -253,7 +253,7 @@ void FileReader::didFail(FileError::ErrorCode errorCode)
     m_error = FileError::create(static_cast<FileError::ErrorCode>(errorCode));
     fireEvent(eventNames().errorEvent);
     fireEvent(eventNames().loadendEvent);
-    
+
     // All possible events have fired and we're done, no more pending activity.
     unsetPendingActivity(this);
 }