Add missing, and remove unnecessary, 'explicit' from constructors. (base/)

The style guide says that constructors which can be called with one
argument should be explicit.

For constructors which cannot be called with exactly one argument,
there is no reason to mark them explicit.

BUG=163357


Review URL: https://chromiumcodereview.appspot.com/11779022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@176881 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 5 insertions, 5 deletions

diff --git a/base/metrics/bucket_ranges.h b/base/metrics/bucket_ranges.h
index 90b9047..210b9a7 100644
--- a/base/metrics/bucket_ranges.h
+++ b/base/metrics/bucket_ranges.h
@@ -30,7 +30,7 @@ class BASE_EXPORT BucketRanges {
  public:
   typedef std::vector<HistogramBase::Sample> Ranges;
 
-  BucketRanges(size_t num_ranges);
+  explicit BucketRanges(size_t num_ranges);
   ~BucketRanges();
 
   size_t size() const { return ranges_.size(); }
diff --git a/base/metrics/histogram_base.h b/base/metrics/histogram_base.h
index 69e1437..949e864 100644
--- a/base/metrics/histogram_base.h
+++ b/base/metrics/histogram_base.h
@@ -69,7 +69,7 @@ class BASE_EXPORT HistogramBase {
     kHexRangePrintingFlag = 0x8000,
   };
 
-  HistogramBase(const std::string& name);
+  explicit HistogramBase(const std::string& name);
   virtual ~HistogramBase();
 
   std::string histogram_name() const { return histogram_name_; }
diff --git a/base/metrics/histogram_samples.cc b/base/metrics/histogram_samples.cc
index e375952..0e0eeb4 100644
--- a/base/metrics/histogram_samples.cc
+++ b/base/metrics/histogram_samples.cc
@@ -13,7 +13,7 @@ namespace {
 
 class SampleCountPickleIterator : public SampleCountIterator {
  public:
-  SampleCountPickleIterator(PickleIterator* iter);
+  explicit SampleCountPickleIterator(PickleIterator* iter);
 
   virtual bool Done() const OVERRIDE;
   virtual void Next() OVERRIDE;
diff --git a/base/metrics/sample_map.h b/base/metrics/sample_map.h
index 22c391bb..cdd1138 100644
--- a/base/metrics/sample_map.h
+++ b/base/metrics/sample_map.h
@@ -46,7 +46,7 @@ class BASE_EXPORT_PRIVATE SampleMapIterator : public SampleCountIterator {
   typedef std::map<HistogramBase::Sample, HistogramBase::Count>
       SampleToCountMap;
 
-  SampleMapIterator(const SampleToCountMap& sample_counts);
+  explicit SampleMapIterator(const SampleToCountMap& sample_counts);
   virtual ~SampleMapIterator();
 
   // SampleCountIterator implementation:
diff --git a/base/metrics/sparse_histogram.h b/base/metrics/sparse_histogram.h
index 346ffeb..ae4530a 100644
--- a/base/metrics/sparse_histogram.h
+++ b/base/metrics/sparse_histogram.h
@@ -46,7 +46,7 @@ class BASE_EXPORT_PRIVATE SparseHistogram : public HistogramBase {
 
  private:
   // Clients should always use FactoryGet to create SparseHistogram.
-  SparseHistogram(const std::string& name);
+  explicit SparseHistogram(const std::string& name);
 
   friend BASE_EXPORT_PRIVATE HistogramBase* DeserializeHistogramInfo(
       PickleIterator* iter);