changed complexity_n to int and fix some whitespaces

include/benchmark/benchmark_api.h

@@ -363,7 +363,7 @@ public:
   // family benchmark, then current benchmark will be part of the computation and complexity_n will
   // represent the length of N.
   BENCHMARK_ALWAYS_INLINE
-  void SetComplexityN(size_t complexity_n) {
+  void SetComplexityN(int complexity_n) {
     complexity_n_ = complexity_n;
   }
 
@@ -444,7 +444,7 @@ private:
   size_t bytes_processed_;
   size_t items_processed_;
 
-  size_t complexity_n_;
+  int complexity_n_;
 
 public:
   // FIXME: Make this private somehow.

include/benchmark/reporter.h

@@ -87,7 +87,7 @@ class BenchmarkReporter {
     // Keep track of arguments to compute asymptotic complexity
     BigO complexity;
     BigOFunc* complexity_lambda;
-    size_t complexity_n;
+    int complexity_n;
 
     // Inform print function whether the current run is a complexity report
     bool report_big_o;
@@ -133,14 +133,14 @@ class BenchmarkReporter {
     error_stream_ = err;
   }
 
-   std::ostream& GetOutputStream() const {
+  std::ostream& GetOutputStream() const {
     return *output_stream_;
   }
 
   std::ostream& GetErrorStream() const {
     return *error_stream_;
   }
-  
+
   virtual ~BenchmarkReporter();
 
   // Write a human readable string to 'out' representing the specified