Version: 51.0.2681.0
OS: Mac

What steps will reproduce the problem?
Run command-
out/Debug/shell_dialogs_unittests.app/Contents/MacOS/shell_dialogs_unittests --gtest_filter=SelectFileDialogMacTest.ExtensionPopup. 

Observe the following warnings are displayed - 

2016-03-22 21:41:11.992 shell_dialogs_unittests[65738:9127396] Unknown class 'GTMUILocalizerAndLayoutTweaker', using 'NSObject' instead. Encountered in Interface Builder file at path /Users/karandeepb/Desktop/chromium/src/out/Debug/shell_dialogs_unittests.app/Contents/Resources/SaveAccessoryView.nib.
2016-03-22 21:41:11.992 shell_dialogs_unittests[65738:9127396] Unknown class 'ChromeUILocalizer', using 'NSObject' instead. Encountered in Interface Builder file at path /Users/karandeepb/Desktop/chromium/src/out/Debug/shell_dialogs_unittests.app/Contents/Resources/SaveAccessoryView.nib.
2016-03-22 21:41:11.992 shell_dialogs_unittests[65738:9127396] Unknown class 'GTMWidthBasedTweaker', using 'NSView' instead. Encountered in Interface Builder file at path /Users/karandeepb/Desktop/chromium/src/out/Debug/shell_dialogs_unittests.app/Contents/Resources/SaveAccessoryView.nib.
2016-03-22 21:41:11.992 shell_dialogs_unittests[65738:9127396] Failed to connect (viewToResize_) outlet from (NSView) to (NSView): missing setter or instance variable
2016-03-22 21:41:11.992 shell_dialogs_unittests[65738:9127396] Failed to connect (viewToSlide_) outlet from (NSView) to (NSPopUpButton): missing setter or instance variable
2016-03-22 21:41:11.992 shell_dialogs_unittests[65738:9127396] Failed to connect (localizer_) outlet from (NSObject) to (NSObject): missing setter or instance variable
2016-03-22 21:41:11.992 shell_dialogs_unittests[65738:9127396] Failed to connect (uiObject_) outlet from (NSObject) to (NSView): missing setter or instance variable

These warnings should not be displayed.