Switch chrome_elf exception handling from breakpad to crashpad

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 33eec4a4660101b985b33d8370c806a07fe80b93..4e49bd368fba5cd67f6018181cb1101c12ab9230 100644
--- a/chrome/common/crash_keys.cc
+++ b/chrome/common/crash_keys.cc
@@ -89,8 +89,10 @@ size_t RegisterChromeCrashKeys() {
   // The following keys may be chunked by the underlying crash logging system,
   // but ultimately constitute a single key-value pair.
   //
-  // If you're adding keys here, please also add them to the list in
-  // //blimp/engine/app/blimp_engine_crash_keys.cc
+  // If you're adding keys here, please also add them to the following lists:
+  // 1. //blimp/engine/app/blimp_engine_crash_keys.cc and
+  // 2. //chrome/app/chrome_crash_reporter_client_win.cc::
+  //    RegisterCrashKeysHelper().
   base::debug::CrashKey fixed_keys[] = {
 #if defined(OS_MACOSX) || defined(OS_WIN)
     { kMetricsClientId, kSmallSize },