Check alpha-sorting of includes during presubmit.

test/cctest/test-dictionary.cc

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 #include "src/v8.h"
+#include "test/cctest/cctest.h"
 
 #include "src/api.h"
 #include "src/debug.h"
 #include "src/execution.h"
 #include "src/factory.h"
+#include "src/global-handles.h"
 #include "src/macro-assembler.h"
 #include "src/objects.h"
-#include "src/global-handles.h"
-#include "test/cctest/cctest.h"
 
 using namespace v8::internal;
 
 namespace {
 
 
 template<typename HashMap>
 static void TestHashMap(Handle<HashMap> table) {
   Isolate* isolate = CcTest::i_isolate();
   Factory* factory = isolate->factory();
@@ skipping 197 matching lines @@
   LocalContext context;
   v8::HandleScope scope(context->GetIsolate());
   Isolate* isolate = CcTest::i_isolate();
   TestHashMapCausesGC(ObjectHashTable::New(isolate, 1));
   TestHashMapCausesGC(isolate->factory()->NewOrderedHashMap());
 }
 #endif
 
 
 }