Cleanup histograms from message loop, as well as kHexRangePrintingFlag.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 9e456c6ad8682ff42088c707877a2e25da3dd99c..d1edbb0ef72626fe3874b8e1d77e95615d5982a9 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -649,11 +649,6 @@ const char kMediaCacheSize[]                = "media-cache-size";
 // Enables Media Router.
 const char kMediaRouter[]                   = "media-router";
 
-// Enables histograming of tasks served by MessageLoop. See
-// about:histograms/Loop for results, which show frequency of messages on each
-// thread, including APC count, object signalling count, etc.
-const char kMessageLoopHistogrammer[]       = "message-loop-histogrammer";
-
 // Enables the recording of metrics reports but disables reporting. In contrast
 // to kDisableMetrics, this executes all the code that a normal client would
 // use for reporting, except the report is dropped rather than sent to the