Fix presubmit error. Trailing whitespace.

src/arm/codegen-arm.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 54 matching lines @@
                                int known_int);
 static bool IsEasyToMultiplyBy(int x);
 
 
 #define __ ACCESS_MASM(masm_)
 
 // -------------------------------------------------------------------------
 // Platform-specific DeferredCode functions.
 
 void DeferredCode::SaveRegisters() {
-  // On ARM you either have a completely spilled frame or you 
+  // On ARM you either have a completely spilled frame or you
   // handle it yourself, but at the moment there's no automation
   // of registers and deferred code.
 }
 
 
 void DeferredCode::RestoreRegisters() {
 }
 
 
 // -------------------------------------------------------------------------
@@ skipping 10184 matching lines @@
   __ bind(&string_add_runtime);
   __ TailCallRuntime(Runtime::kStringAdd, 2, 1);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM