base: Remove the string logging from CHECK().

chrome/app_shim/app_mode_loader_mac.mm

Index: chrome/app_shim/app_mode_loader_mac.mm
diff --git a/chrome/app_shim/app_mode_loader_mac.mm b/chrome/app_shim/app_mode_loader_mac.mm
index e4a3686f1a693d4c20903fff5b58cb95b208b88a..f60ff57fbea092f8b1a6f467412cd7f565151c3a 100644
--- a/chrome/app_shim/app_mode_loader_mac.mm
+++ b/chrome/app_shim/app_mode_loader_mac.mm
@@ -48,13 +48,15 @@ int LoadFrameworkAndStart(app_mode::ChromeAppModeInfo* info) {
 
   // Get the current main bundle, i.e., that of the app loader that's running.
   NSBundle* app_bundle = [NSBundle mainBundle];
-  CHECK(app_bundle) << "couldn't get loader bundle";
+  // couldn't get loader bundle
+  CHECK(app_bundle);
 
   // ** 1: Get path to outer Chrome bundle.
   // Get the bundle ID of the browser that created this app bundle.
   NSString* cr_bundle_id = base::mac::ObjCCast<NSString>(
       [app_bundle objectForInfoDictionaryKey:app_mode::kBrowserBundleIDKey]);
-  CHECK(cr_bundle_id) << "couldn't get browser bundle ID";
+  // couldn't get browser bundle ID
+  CHECK(cr_bundle_id);
 
   // First check if Chrome exists at the last known location.
   base::FilePath cr_bundle_path;
@@ -121,11 +123,13 @@ int LoadFrameworkAndStart(app_mode::ChromeAppModeInfo* info) {
   // Read information about the this app shortcut from the Info.plist.
   // Don't check for null-ness on optional items.
   NSDictionary* info_plist = [app_bundle infoDictionary];
-  CHECK(info_plist) << "couldn't get loader Info.plist";
+  // couldn't get loader Info.plist
+  CHECK(info_plist);
 
   info->app_mode_id = SysNSStringToUTF8(
       [info_plist objectForKey:app_mode::kCrAppModeShortcutIDKey]);
-  CHECK(info->app_mode_id.size()) << "couldn't get app shortcut ID";
+  // couldn't get app shortcut ID
+  CHECK(info->app_mode_id.size());
 
   info->app_mode_name = SysNSStringToUTF16(
       [info_plist objectForKey:app_mode::kCrAppModeShortcutNameKey]);