Fix crash reporting of child process command line switches.

chrome/common/crash_keys.cc

Index: chrome/common/crash_keys.cc
diff --git a/chrome/common/crash_keys.cc b/chrome/common/crash_keys.cc
index 0de18608c0ca775acdc8f382a8a53894b325aa53..179b1bb3281d431adf10379f9687dfef3f66c8e6 100644
--- a/chrome/common/crash_keys.cc
+++ b/chrome/common/crash_keys.cc
@@ -280,6 +280,10 @@ void SetSwitchesFromCommandLine(const CommandLine* command_line) {
     if (IsBoringSwitch(switch_str))
       continue;
 
+    // Stop if there are too many switches.
+    if (i > crash_keys::kSwitchesMaxCount)
+      break;
+
     std::string key = base::StringPrintf(kSwitch, key_i++);
     base::debug::SetCrashKeyValue(key, switch_str);
   }