App Version: 64.0.3269.0 canary
iOS Version:10.3.3, 11.1.1
Device : iPhones

Steps to reproduce : 
1. Launch chrome.
2. Go to chrome://flags
3. Enable “toolbar-snapshot-animation”
4. force quit the app and Relaunch chrome.
5. Goto any site say facebook.com
 
Observed results:
App Crashes

Note : Works fine in 64.0.3267.0 canary

Expected results:
App should not crash.

Number of times you were able to reproduce: 5/5
Bug reproducible after clean install: Yes
Bug reproducible after clearing cache and cookies: Yes
Bug reproducible on Chrome Mobile on Android: NA
Bug reproducible on Dolphin/Safari/Firefox: NA
Bug reproducible on current stable build (App Version, iOS Version):  NA, New UI Implementation in M64
Bug reproducible on the current beta channel build (App Version, iOS Version): NA, New UI Implementation in M64

Type-bug-regression? NA, New UI Implementation in M64

Link to Video :
https://drive.google.com/a/google.com/file/d/1zKEZFIyKFVYMUDbeTt3hrpDfgbfWqZa2/view?usp=sharing

Crash log :
https://crash.corp.google.com/browse?stbtiq=32d2d23819bd4001&sql_dialect=googlesql

Stack Trace :
Thread 0 (id: 1027) CRASHED [EXC_SOFTWARE / UNCAUGHT_NS_EXCEPTION @ 0x1c817b3d ] MAGIC SIGNATURE THREAD
Stack Quality81%Show frame trust levels
0x1c817b3d	(CoreFoundation + 0x000fab3d )	__exceptionPreprocess
0x1ba9f065	(libobjc.A.dylib + 0x00007065 )	objc_exception_throw
0x1c81cfcf	(CoreFoundation + 0x000fffcf )	-[NSObject(NSObject) doesNotRecognizeSelector:]
0x1c81b0c1	(CoreFoundation + 0x000fe0c1 )	___forwarding___
0x1c743dc6	(CoreFoundation + 0x00026dc6 )	_CF_forwarding_prep_0
0x002116fd	(Chrome -web_toolbar_controller.mm:1760 )	-[WebToolbarController contractOmnibox]
0x0020c83d	(Chrome -web_toolbar_controller.mm )	-[WebToolbarController locationBarHasResignedFirstResponder]
0x0021acf7	(Chrome -location_bar_controller_impl.mm:271 )	LocationBarControllerImpl::OnKillFocus()
0x002289f7	(Chrome -omnibox_view_ios.mm:402 )	OmniboxViewIOS::OnDidEndEditing()
0x002288ed	(Chrome -omnibox_view_ios.mm:137 )	-[AutocompleteTextFieldDelegate textFieldDidEndEditing:]
0x21b743ef	(UIKit + 0x001393ef )	-[UITextField _resignFirstResponder]
0x21b4c443	(UIKit + 0x00111443 )	-[UIResponder _finishResignFirstResponder]
0x2241f455	(UIKit + 0x009e4455 )	-[UITextField _finishResignFirstResponder]
0x21af0437	(UIKit + 0x000b5437 )	-[UIResponder resignFirstResponder]
0x21b74075	(UIKit + 0x00139075 )	-[UITextField resignFirstResponder]
0x0022ae67	(Chrome -omnibox_view_ios.mm:790 )	OmniboxViewIOS::HideKeyboardAndEndEditing()
0x0020cc0b	(Chrome -web_toolbar_controller.mm:956 )	-[WebToolbarController cancelOmniboxEdit]
0x0020c4c1	(Chrome -web_toolbar_controller.mm:887 )	-[WebToolbarController loadGURLFromLocationBar:transition:]
0x0021a50f	(Chrome -location_bar_controller_impl.mm:205 )	LocationBarControllerImpl::OnAutocompleteAccept(GURL const&, WindowOpenDisposition, ui::PageTransition, AutocompleteMatchType::Type)
0x00e54b61	(Chrome -omnibox_edit_model.cc:711 )	OmniboxEditModel::OpenMatch(AutocompleteMatch, WindowOpenDisposition, GURL const&, std::__1::basic_string<unsigned short, base::string16_internals::string16_char_traits, std::__1::allocator<unsigned short> > const&, unsigned long)
0x00e59455	(Chrome -omnibox_view.cc:91 )	OmniboxView::OpenMatch(AutocompleteMatch const&, WindowOpenDisposition, GURL const&, std::__1::basic_string<unsigned short, base::string16_internals::string16_char_traits, std::__1::allocator<unsigned short> > const&, unsigned long)
0x00221c27	(Chrome -omnibox_popup_view_ios.mm:157 )	OmniboxPopupViewIOS::OnMatchSelected(AutocompleteMatch const&, unsigned long)
0x0021b533	(Chrome -omnibox_popup_mediator.mm:81 )	-[OmniboxPopupMediator autocompleteResultConsumer:didSelectRow:]
0x00220c2d	(Chrome -omnibox_popup_view_controller.mm:448 )	-[OmniboxPopupViewController tableView:didSelectRowAtIndexPath:]
0x21b70bbd	(UIKit + 0x00135bbd )	-[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:]
0x21c1cb63	(UIKit + 0x001e1b63 )	-[UITableView _userSelectRowAtPendingSelectionIndexPath:]
0x21cc8981	(UIKit + 0x0028d981 )	_runAfterCACommitDeferredBlocks
0x21cbbc91	(UIKit + 0x00280c91 )	_cleanUpAfterCAFlushAndRunDeferredBlocks
0x21a3d8bb	(UIKit + 0x000028bb )	_afterCACommitHandler
0x1c7d3801	(CoreFoundation + 0x000b6801 )	__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__
0x1c7d1a53	(CoreFoundation + 0x000b4a53 )	__CFRunLoopDoObservers
0x1c7d2015	(CoreFoundation + 0x000b5015 )	__CFRunLoopRun
0x1c7251ad	(CoreFoundation + 0x000081ad )	CFRunLoopRunSpecific
0x1c724fcf	(CoreFoundation + 0x00007fcf )	CFRunLoopRunInMode
0x1decfb3f	(GraphicsServices + 0x00009b3f )	GSEventRunModal
0x21aada51	(UIKit + 0x00072a51 )	UIApplicationMain
0x0000e5c5	(Chrome -chrome_exe_main.mm:55 )	main
0x1bf124e9	(libdyld.dylib + 0x000034e9 )	start