Wrap -[BrowserCrApplication nextEventMatchingMask:…] with base::mac::CallWithEHFrame.

chrome/browser/chrome_browser_application_mac.mm

Index: chrome/browser/chrome_browser_application_mac.mm
diff --git a/chrome/browser/chrome_browser_application_mac.mm b/chrome/browser/chrome_browser_application_mac.mm
index a332cb17c4053ccfd86da5a91d7b6229b7f0ee67..5b4967e7564bc58e91cae4cec7a0ab3fda63c0c2 100644
--- a/chrome/browser/chrome_browser_application_mac.mm
+++ b/chrome/browser/chrome_browser_application_mac.mm
@@ -4,6 +4,7 @@
 
 #import "chrome/browser/chrome_browser_application_mac.h"
 
+#include <AvailabilityMacros.h>
 #include <objc/objc-exception.h>
 
 #import "base/auto_reset.h"
@@ -266,6 +267,32 @@ void CancelTerminate() {
   [appController stopTryingToTerminateApplication:self];
 }
 
+// The event |mask| has historically been declared as an NSUInteger
+// (unsigned long). Starting in the 10.12 SDK, the mask type changed to
+// NSEventMask (unsigned long long) if __LP64__ and NSUInteger otherwise.
+// These types are incompatible, which creates an issue for suppporting
+// both 10.10/10.11 and 10.12 SDKs. Work around it using the #if below.
+- (NSEvent*)nextEventMatchingMask:
+#if !defined(MAC_OS_X_VERSION_10_12) || \
+    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_12 || \
+    !defined(__LP64__)
+                                  (NSUInteger)mask
+#else
+                                  (NSEventMask)mask
+#endif
+                        untilDate:(NSDate*)expiration
+                           inMode:(NSString*)mode
+                          dequeue:(BOOL)dequeue {
+  __block NSEvent* event = nil;
+  base::mac::CallWithEHFrame(^{
+      event = [super nextEventMatchingMask:mask
+                                 untilDate:expiration
+                                    inMode:mode
+                                   dequeue:dequeue];
+  });
+  return event;
+}
+
 - (BOOL)sendAction:(SEL)anAction to:(id)aTarget from:(id)sender {
   // The Dock menu contains an automagic section where you can select
   // amongst open windows.  If a window is closed via JavaScript while