Remove v8- prefix of file name in libsampler.

test/cctest/libsampler/test-sampler.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 // Tests of sampler functionalities.
 
-#include "src/libsampler/v8-sampler.h"
+#include "src/libsampler/sampler.h"
 
 #include "src/base/platform/platform.h"
 #include "test/cctest/cctest.h"
 
 
 namespace v8 {
 namespace sampler {
 
 namespace {
 
@@ skipping 115 matching lines @@
   CompileRun(sampler_test_source);
   v8::Local<v8::Function> function = GetFunction(env.local(), "start");
 
   int32_t repeat_count = 100;
   v8::Local<v8::Value> args[] = {v8::Integer::New(isolate, repeat_count)};
   RunSampler(env.local(), function, args, arraysize(args), 100, 100);
 }
 
 }  // namespace sampler
 }  // namespace v8