[Mac] Move event hooks from CrApplication to BrowserCrApplication.

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 c7706f234226b5a51a048982bac4b21a2e0cd67a..c219252d7ed9dcac0fb7387b19a16823498d63c0 100644
--- a/chrome/browser/chrome_browser_application_mac.mm
+++ b/chrome/browser/chrome_browser_application_mac.mm
@@ -215,7 +215,10 @@ void SwizzleInit() {
 
 - (id)init {
   SwizzleInit();
-  return [super init];
+  if ((self = [super init])) {
+    eventHooks_.reset([[NSMutableArray alloc] init]);
+  }
+  return self;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -357,6 +360,22 @@ void SwizzleInit() {
   return [super sendAction:anAction to:aTarget from:sender];
 }
 
+- (void)addEventHook:(id<CrApplicationEventHookProtocol>)handler {
+  [eventHooks_ addObject:handler];
+}
+
+- (void)removeEventHook:(id<CrApplicationEventHookProtocol>)handler {
+  [eventHooks_ removeObject:handler];
+}
+
+- (void)sendEvent:(NSEvent*)event {
+  content::mac::ScopedSendingEvent sendingEventScoper;
+  for (id<CrApplicationEventHookProtocol> handler in eventHooks_.get()) {
+    [handler hookForEvent:event];
+  }
+  [super sendEvent:event];
+}
+
 // NSExceptions which are caught by the event loop are logged here.
 // NSException uses setjmp/longjmp, which can be very bad for C++, so
 // we attempt to track and report them.