Use string for Histogram names since these are all ASCII anyway wide-characte...

chrome/browser/history/history_backend.cc

Index: chrome/browser/history/history_backend.cc
===================================================================
--- chrome/browser/history/history_backend.cc	(revision 10269)
+++ chrome/browser/history/history_backend.cc	(working copy)
@@ -567,7 +567,7 @@
   // Start expiring old stuff.
   expirer_.StartArchivingOldStuff(TimeDelta::FromDays(kArchiveDaysThreshold));
 
-  HISTOGRAM_TIMES(L"History.InitTime",
+  HISTOGRAM_TIMES("History.InitTime",
                   TimeTicks::Now() - beginning_time);
 }
 
@@ -997,7 +997,7 @@
   request->ForwardResult(QueryHistoryRequest::TupleType(request->handle(),
                                                         &request->value));
 
-  HISTOGRAM_TIMES(L"History.QueryHistory",
+  HISTOGRAM_TIMES("History.QueryHistory",
                   TimeTicks::Now() - beginning_time);
 }
 
@@ -1231,7 +1231,7 @@
     if (!success)
       *data = NULL;  // This will tell the callback there was an error.
 
-    HISTOGRAM_TIMES(L"History.GetPageThumbnail",
+    HISTOGRAM_TIMES("History.GetPageThumbnail",
                     TimeTicks::Now() - beginning_time);
   }
 }
@@ -1397,7 +1397,7 @@
           TimeDelta::FromDays(kFavIconRefetchDays);
     }
 
-    HISTOGRAM_TIMES(L"History.GetFavIconForURL",
+    HISTOGRAM_TIMES("History.GetFavIconForURL",
                     TimeTicks::Now() - beginning_time);
   }
 
@@ -1831,4 +1831,3 @@
 }
 
 }  // namespace history
-