[inspector] Drop V8_VERSION checks.

src/inspector/V8StackTraceImpl.cpp

 // 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/V8StackTraceImpl.h"
 
 #include "src/inspector/StringUtil.h"
 #include "src/inspector/V8Debugger.h"
 #include "src/inspector/protocol/Protocol.h"
 
@@ skipping 140 matching lines @@
   return result;
 }
 
 std::unique_ptr<V8StackTraceImpl> V8StackTraceImpl::capture(
     V8Debugger* debugger, int contextGroupId, size_t maxStackSize,
     const String16& description) {
   v8::Isolate* isolate = v8::Isolate::GetCurrent();
   v8::HandleScope handleScope(isolate);
   v8::Local<v8::StackTrace> stackTrace;
   if (isolate->InContext()) {
-#if V8_MAJOR_VERSION >= 5
     isolate->GetCpuProfiler()->CollectSample();
-#endif
     stackTrace = v8::StackTrace::CurrentStackTrace(isolate, maxStackSize,
                                                    stackTraceOptions);
   }
   return V8StackTraceImpl::create(debugger, contextGroupId, stackTrace,
                                   maxStackSize, description);
 }
 
 std::unique_ptr<V8StackTraceImpl> V8StackTraceImpl::cloneImpl() {
   std::vector<Frame> framesCopy(m_frames);
   return wrapUnique(
@@ skipping 92 matching lines @@
     stackTrace.append(String16::fromInteger(frame.lineNumber()));
     stackTrace.append(':');
     stackTrace.append(String16::fromInteger(frame.columnNumber()));
     stackTrace.append(')');
   }
   String16 string = stackTrace.toString();
   return StringBufferImpl::adopt(string);
 }
 
 }  // namespace v8_inspector