[Mac] Use the app's version as the app shim bundle version.

chrome/common/mac/app_mode_chrome_locator.mm

Index: chrome/common/mac/app_mode_chrome_locator.mm
diff --git a/chrome/common/mac/app_mode_chrome_locator.mm b/chrome/common/mac/app_mode_chrome_locator.mm
index 923e671d804e356e6e42cfd1a17cd96ff6e8081d..efd272e706ba56b748e4b76b96d76cbd03aa07ac 100644
--- a/chrome/common/mac/app_mode_chrome_locator.mm
+++ b/chrome/common/mac/app_mode_chrome_locator.mm
@@ -12,6 +12,7 @@
 #include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/common/chrome_constants.h"
+#include "chrome/common/mac/app_mode_common.h"
 
 namespace app_mode {
 
@@ -54,7 +55,12 @@ bool GetChromeBundleInfo(const base::FilePath& chrome_bundle,
       !base::PathExists(base::mac::NSStringToFilePath(cr_versioned_path))) {
     // Read version string.
     NSString* cr_version = ObjCCast<NSString>(
-        [cr_bundle objectForInfoDictionaryKey:@"CFBundleShortVersionString"]);
+        [cr_bundle objectForInfoDictionaryKey:app_mode::kCrBundleVersionKey]);
+    if (!cr_version) {
+      // Older bundles have the Chrome version in the following key.
+      cr_version = ObjCCast<NSString>([cr_bundle
+          objectForInfoDictionaryKey:app_mode::kCFBundleShortVersionStringKey]);
+    }
     if (!cr_version)
       return false;