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

Source/core/platform/Arena.cpp

Index: Source/core/platform/Arena.cpp
diff --git a/Source/core/platform/Arena.cpp b/Source/core/platform/Arena.cpp
index fff0291ded4dae90c1e9abcd9db9f6e83e7e9dcd..26b62753fc38862b474f87acf367ad71b5d6b7b2 100644
--- a/Source/core/platform/Arena.cpp
+++ b/Source/core/platform/Arena.cpp
@@ -94,7 +94,7 @@ void InitArenaPool(ArenaPool* pool, const char*, unsigned size, unsigned align)
      pool->first.next = NULL;
      pool->first.base = pool->first.avail = pool->first.limit = (uword)ARENA_ALIGN(&pool->first + 1);
      pool->current = &pool->first;
-     pool->arenasize = size;                                  
+     pool->arenasize = size;
 }
 
 void* ArenaAllocate(ArenaPool* pool, unsigned int numBytes, unsigned int& bytesAllocated)
@@ -103,7 +103,7 @@ void* ArenaAllocate(ArenaPool* pool, unsigned int numBytes, unsigned int& bytesA
     char* returnPointer;
 
     ASSERT((numBytes & pool->mask) == 0);
-    
+
     numBytes = (uword)ARENA_ALIGN(numBytes);
 
     // attempt to allocate from arenas at pool->current
@@ -120,7 +120,7 @@ void* ArenaAllocate(ArenaPool* pool, unsigned int numBytes, unsigned int& bytesA
     }
 
     // attempt to allocate from the heap
-    {  
+    {
         unsigned int size = max(pool->arenasize, numBytes);
         size += sizeof *arena + pool->mask;  /* header and alignment slop */
 #ifdef DEBUG_ARENA_MALLOC
@@ -165,7 +165,7 @@ static void FreeArenaList(ArenaPool* pool, Arena* head)
     do {
         *arenaPointer = arena->next;
 
-#ifdef DEBUG        
+#ifdef DEBUG
         memset((void*)(arena), FREE_PATTERN, (arena)->limit - (uword)(arena));
 #endif