FBTF: Moves code to the headers.

base/histogram.cc

Index: base/histogram.cc
diff --git a/base/histogram.cc b/base/histogram.cc
index add7954fd68949058258605a490666e446ca4d80..e045d812a40a871d17e8ba8e0e3ebe87cf13cb10 100644
--- a/base/histogram.cc
+++ b/base/histogram.cc
@@ -503,6 +503,9 @@ Histogram::SampleSet::SampleSet()
       square_sum_(0) {
 }
 
+Histogram::SampleSet::~SampleSet() {
+}
+
 void Histogram::SampleSet::Resize(const Histogram& histogram) {
   counts_.resize(histogram.bucket_count(), 0);
 }
@@ -625,6 +628,9 @@ scoped_refptr<Histogram> LinearHistogram::FactoryTimeGet(
                     bucket_count, flags);
 }
 
+LinearHistogram::~LinearHistogram() {
+}
+
 LinearHistogram::LinearHistogram(const std::string& name, Sample minimum,
     Sample maximum, size_t bucket_count)
     : Histogram(name, minimum >= 1 ? minimum : 1, maximum, bucket_count) {