Remove v8- prefix of file name in libsampler.

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 2014 matching lines @@
 
   public_configs = [ ":libplatform_config" ]
 
   deps = [
     ":v8_libbase",
   ]
 }
 
 v8_source_set("v8_libsampler") {
   sources = [
-    "src/libsampler/v8-sampler.cc",
-    "src/libsampler/v8-sampler.h",
+    "src/libsampler/sampler.cc",
+    "src/libsampler/sampler.h",
   ]
 
   configs = [ ":internal_config_base" ]
 
   public_configs = [ ":libsampler_config" ]
 
   deps = [
     ":v8_libbase",
   ]
 }
@@ skipping 348 matching lines @@
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs = [ ":internal_config" ]
 }
 
 v8_fuzzer("wasm_asmjs_fuzzer") {
 }