[inspector] change implementation file extension from cpp to cc

src/inspector/string-util.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.
 
-#include "src/inspector/StringUtil.h"
+#include "src/inspector/string-util.h"
 
 #include "src/inspector/protocol/Protocol.h"
 
 namespace v8_inspector {
 
 v8::Local<v8::String> toV8String(v8::Isolate* isolate, const String16& string) {
   if (string.isEmpty()) return v8::String::Empty(isolate);
   return v8::String::NewFromTwoByte(
              isolate, reinterpret_cast<const uint16_t*>(string.characters16()),
              v8::NewStringType::kNormal, string.length())
@@ skipping 170 matching lines @@
 std::unique_ptr<StringBufferImpl> StringBufferImpl::adopt(String16& string) {
   return wrapUnique(new StringBufferImpl(string));
 }
 
 StringBufferImpl::StringBufferImpl(String16& string) {
   m_owner.swap(string);
   m_string = toStringView(m_owner);
 }
 
 }  // namespace v8_inspector