o3d: Fix the mac build broken on r53286.

o3d/statsreport/const-mac.mm

 /*
  * Copyright 2010, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 17 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 
 // Constants for Posix stats aggregation and uploading
 #include "const-mac.h"
 
 namespace stats_report {
 
-const char kTimingsKeyName = "Timings";
-const char kCountsKeyName = "Counts";
-const char kIntegersKeyName = "Integers";
-const char kBooleansKeyName = "Booleans";
+const char kTimingsKeyName[] = "Timings";
+const char kCountsKeyName[] = "Counts";
+const char kIntegersKeyName[] = "Integers";
+const char kBooleansKeyName[] = "Booleans";
 
 static NSString* FindGoogleAppDirectory(void) {
   NSString *applicationSupportFolder =
       [NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory,
                                            NSUserDomainMask,
                                            YES) objectAtIndex:0];
 
   NSString *googleAppSupportPath =
   [applicationSupportFolder stringByAppendingString:@"/Google"];
 
   if (![[NSFileManager defaultManager] fileExistsAtPath:googleAppSupportPath])
     [[NSFileManager defaultManager] createDirectoryAtPath:googleAppSupportPath
                                               attributes:nil];
 
   return googleAppSupportPath;
 }
 
 NSString* O3DStatsPath(void) {
   static NSString* the_path = NULL;
   if (!the_path) {
     the_path = [FindGoogleAppDirectory() stringByAppendingString:@"/O3D_Stats"];
     [the_path retain];
   }
   return the_path;
 }
 
 }  // namespace stats_report