Collect UMA statistics on which chrome://flags lead to chrome restart on ChromeOS.

chrome/browser/about_flags_unittest.cc

Index: chrome/browser/about_flags_unittest.cc
diff --git a/chrome/browser/about_flags_unittest.cc b/chrome/browser/about_flags_unittest.cc
index 0cb9fa78835f36a552cf7fe0ffe1ed07170e7871..a7d7f084a195eaf69853d9d2824716d09be80e5d 100644
--- a/chrome/browser/about_flags_unittest.cc
+++ b/chrome/browser/about_flags_unittest.cc
@@ -242,13 +242,13 @@ TEST_F(AboutFlagsTest, CompareSwitchesToCurrentCommandLine) {
   CommandLine new_command_line(CommandLine::NO_PROGRAM);
   ConvertFlagsToSwitches(&flags_storage_, &new_command_line, kAddSentinels);
 
-  EXPECT_FALSE(AreSwitchesIdenticalToCurrentCommandLine(new_command_line,
-                                                        command_line));
+  EXPECT_FALSE(AreSwitchesIdenticalToCurrentCommandLine(
+      new_command_line, command_line, NULL));
 
   ConvertFlagsToSwitches(&flags_storage_, &command_line, kAddSentinels);
 
-  EXPECT_TRUE(AreSwitchesIdenticalToCurrentCommandLine(new_command_line,
-                                                       command_line));
+  EXPECT_TRUE(AreSwitchesIdenticalToCurrentCommandLine(
+      new_command_line, command_line, NULL));
 
   // Now both have flags but different.
   SetExperimentEnabled(&flags_storage_, kFlags1, false);
@@ -257,8 +257,8 @@ TEST_F(AboutFlagsTest, CompareSwitchesToCurrentCommandLine) {
   CommandLine another_command_line(CommandLine::NO_PROGRAM);
   ConvertFlagsToSwitches(&flags_storage_, &another_command_line, kAddSentinels);
 
-  EXPECT_FALSE(AreSwitchesIdenticalToCurrentCommandLine(new_command_line,
-                                                        another_command_line));
+  EXPECT_FALSE(AreSwitchesIdenticalToCurrentCommandLine(
+      new_command_line, another_command_line, NULL));
 }
 
 TEST_F(AboutFlagsTest, RemoveFlagSwitches) {