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

Source/modules/webdatabase/SQLTransactionBackend.cpp

Index: Source/modules/webdatabase/SQLTransactionBackend.cpp
diff --git a/Source/modules/webdatabase/SQLTransactionBackend.cpp b/Source/modules/webdatabase/SQLTransactionBackend.cpp
index 35c582064b9ee67eb0d0bb0551d5a1adf220aac8..505e6bfefbd026f2136a125092b7f4101bf2d645 100644
--- a/Source/modules/webdatabase/SQLTransactionBackend.cpp
+++ b/Source/modules/webdatabase/SQLTransactionBackend.cpp
@@ -227,7 +227,7 @@
 // to wait for further action.
 
 
-// The Life-Cycle of a SQLTransaction i.e. Who's keeping the SQLTransaction alive? 
+// The Life-Cycle of a SQLTransaction i.e. Who's keeping the SQLTransaction alive?
 // ==============================================================================
 // The RefPtr chain goes something like this:
 //
@@ -304,7 +304,7 @@
 //     - DatabaseBackend::close() will iterate
 //       DatabaseBackend::m_transactionQueue and call
 //       notifyDatabaseThreadIsShuttingDown() on each transaction there.
-//        
+//
 //     Phase 2. After scheduling, before state AcquireLock
 //
 //     - If the interruption occures before the DatabaseTransactionTask is