[debug] do not report unnecessary coverage data.

src/debug/debug-coverage.h

 // Copyright 2017 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.
 
 #ifndef V8_DEBUG_DEBUG_COVERAGE_H_
 #define V8_DEBUG_DEBUG_COVERAGE_H_
 
 #include <vector>
 
 #include "src/debug/debug-interface.h"
 #include "src/objects.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declaration.
 class Isolate;
 
 struct CoverageFunction {
   CoverageFunction(int s, int e, uint32_t c, Handle<String> n)
       : start(s), end(e), count(c), name(n) {}
   int start;
   int end;
   uint32_t count;
   Handle<String> name;
 };
 
 struct CoverageScript {
   // Initialize top-level function in case it has been garbage-collected.
-  CoverageScript(Isolate* isolate, Handle<Script> s) : script(s) {}
+  explicit CoverageScript(Handle<Script> s) : script(s) {}
   Handle<Script> script;
   // Functions are sorted by start position, from outer to inner function.
   std::vector<CoverageFunction> functions;
 };
 
 class Coverage : public std::vector<CoverageScript> {
  public:
   // Collecting precise coverage only works if the modes kPreciseCount or
   // kPreciseBinary is selected. The invocation count is reset on collection.
   // In case of kPreciseCount, an updated count since last collection is
@@ skipping 11 matching lines @@
   static Coverage* Collect(Isolate* isolate,
                            v8::debug::Coverage::Mode collectionMode);
 
   Coverage() {}
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_COVERAGE_H_