[inspector] fixed all shorten-64-to-32 warnings

src/inspector/v8-heap-profiler-agent-impl.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/v8-heap-profiler-agent-impl.h"
 
 #include "src/inspector/injected-script.h"
 #include "src/inspector/protocol/Protocol.h"
 #include "src/inspector/string-util.h"
 #include "src/inspector/v8-debugger.h"
@@ skipping 276 matching lines @@
                                               String16* heapSnapshotObjectId) {
   v8::HandleScope handles(m_isolate);
   v8::Local<v8::Value> value;
   v8::Local<v8::Context> context;
   if (!m_session->unwrapObject(errorString, objectId, &value, &context,
                                nullptr) ||
       value->IsUndefined())
     return;
 
   v8::SnapshotObjectId id = m_isolate->GetHeapProfiler()->GetObjectId(value);
-  *heapSnapshotObjectId = String16::fromInteger(id);
+  *heapSnapshotObjectId = String16::fromInteger(static_cast<size_t>(id));
 }
 
 void V8HeapProfilerAgentImpl::requestHeapStatsUpdate() {
   HeapStatsStream stream(&m_frontend);
   v8::SnapshotObjectId lastSeenObjectId =
       m_isolate->GetHeapProfiler()->GetHeapStats(&stream);
   m_frontend.lastSeenObjectId(
       lastSeenObjectId, m_session->inspector()->client()->currentTimeMS());
 }
 
@@ skipping 90 matching lines @@
     *errorString = "Cannot access v8 sampled heap profile.";
     return;
   }
   v8::AllocationProfile::Node* root = v8Profile->GetRootNode();
   *profile = protocol::HeapProfiler::SamplingHeapProfile::create()
                  .setHead(buildSampingHeapProfileNode(root))
                  .build();
 }
 
 }  // namespace v8_inspector