Revert of Switch chrome_elf exception handling from breakpad to crashpad.

chrome/common/chrome_constants.cc

Index: chrome/common/chrome_constants.cc
diff --git a/chrome/common/chrome_constants.cc b/chrome/common/chrome_constants.cc
index 8d3429c30d37352ab2eef0f41c53b57e56854d0d..4b906b68563c8ecda9adb96cb9256df570f2a76d 100644
--- a/chrome/common/chrome_constants.cc
+++ b/chrome/common/chrome_constants.cc
@@ -120,7 +120,6 @@
 
 #if defined(OS_WIN)
 const base::FilePath::CharType kBrowserResourcesDll[] = FPL("chrome.dll");
-const base::FilePath::CharType kChromeElfDllName[] = FPL("chrome_elf.dll");
 const base::FilePath::CharType kStatusTrayWindowClass[] =
     FPL("Chrome_StatusTrayWindow");
 #endif  // defined(OS_WIN)
@@ -200,6 +199,13 @@
 const int kHighestRendererOomScore = 1000;
 #endif
 
+#if defined(OS_WIN)
+const wchar_t kMetroNavigationAndSearchMessage[] =
+    L"CHROME_METRO_NAV_SEARCH_REQUEST";
+const wchar_t kMetroGetCurrentTabInfoMessage[] =
+    L"CHROME_METRO_GET_CURRENT_TAB_INFO";
+#endif
+
 #if defined(OS_CHROMEOS)
 const char kProfileDirPrefix[] = "u-";
 const char kLegacyProfileDir[] = "user";