Switch case fall through property for the cases that have same case content.

base/prefs/json_pref_store.cc

 // Copyright (c) 2012 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.
 
 #include "base/prefs/json_pref_store.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 336 matching lines @@
         read_only_ = true;
         break;
       case PREF_READ_ERROR_NONE:
         DCHECK(read_result->value.get());
         unfiltered_prefs.reset(
             static_cast<base::DictionaryValue*>(read_result->value.release()));
         break;
       case PREF_READ_ERROR_NO_FILE:
         // If the file just doesn't exist, maybe this is first run.  In any case
         // there's no harm in writing out default prefs in this case.
-        break;
       case PREF_READ_ERROR_JSON_PARSE:
       case PREF_READ_ERROR_JSON_REPEAT:
         break;
       case PREF_READ_ERROR_ASYNCHRONOUS_TASK_INCOMPLETE:
         // This is a special error code to be returned by ReadPrefs when it
         // can't complete synchronously, it should never be returned by the read
         // operation itself.
-        NOTREACHED();
-        break;
       case PREF_READ_ERROR_MAX_ENUM:
         NOTREACHED();
         break;
     }
   }
 
   if (pref_filter_) {
     filtering_in_progress_ = true;
     const PrefFilter::PostFilterOnLoadCallback post_filter_on_load_callback(
         base::Bind(
@@ skipping 150 matching lines @@
   DCHECK_EQ(31, num_buckets);
 
   // The histogram below is an expansion of the UMA_HISTOGRAM_CUSTOM_COUNTS
   // macro adapted to allow for a dynamically suffixed histogram name.
   // Note: The factory creates and owns the histogram.
   base::HistogramBase* histogram = base::Histogram::FactoryGet(
       histogram_name, min_value, max_value, num_buckets,
       base::HistogramBase::kUmaTargetedHistogramFlag);
   return histogram;
 }