Typo spelling in comment corrected.

base/histogram.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Histogram is an object that aggregates statistics, and can summarize them in
 // various forms, including ASCII graphical, HTML, and numerically (as a
 // vector of numbers corresponding to each of the aggregating buckets).
 
 // It supports calls to accumulate either time intervals (which are processed
 // as integral number of milliseconds), or arbitrary integral units.
@@ skipping 414 matching lines @@
   // Produce actual graph (set of blank vs non blank char's) for a bucket.
   void WriteAsciiBucketGraph(double current_size, double max_size,
                              std::string* output) const;
 
   //----------------------------------------------------------------------------
   // Invariant values set at/near construction time
 
   // ASCII version of original name given to the constructor.  All identically
   // named instances will  be coalesced cross-project TODO(jar).
   // If a user needs one histogram name to be called by several places in a
-  // single process, a central function should be defined by teh user, which
+  // single process, a central function should be defined by the user, which
   // defins the single declared instance of the named histogram.
   const std::string histogram_name_;
   Sample declared_min_;  // Less than this goes into counts_[0]
   Sample declared_max_;  // Over this goes into counts_[bucket_count_ - 1].
   size_t bucket_count_;  // Dimension of counts_[].
 
   // Flag the histogram for recording by UMA via metric_services.h.
   Flags flags_;
 
   // For each index, show the least value that can be stored in the
@@ skipping 137 matching lines @@
   // lock protects access to the above map.
   static Lock* lock_;
 
   // Dump all known histograms to log.
   static bool dump_on_exit_;
 
   DISALLOW_COPY_AND_ASSIGN(StatisticsRecorder);
 };
 
 #endif  // BASE_HISTOGRAM_H_