Check alpha-sorting of includes during presubmit.

test/cctest/test-thread-termination.cc

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 #include "src/v8.h"
+#include "test/cctest/cctest.h"
+
 #include "src/platform.h"
-#include "test/cctest/cctest.h"
 
 
 v8::internal::Semaphore* semaphore = NULL;
 
 
 void Signal(const v8::FunctionCallbackInfo<v8::Value>& args) {
   semaphore->Signal();
 }
 
 
@@ skipping 354 matching lines @@
   isolate->EnqueueMicrotask(v8::Function::New(isolate, MicrotaskShouldNotRun));
   isolate->RunMicrotasks();
 
   v8::V8::CancelTerminateExecution(isolate);
   isolate->RunMicrotasks();  // should not run MicrotaskShouldNotRun
 
   thread.Join();
   delete semaphore;
   semaphore = NULL;
 }