[ObjC ARC] Converts ios/chrome/app/application_delegate:test_support to ARC.

ios/chrome/app/application_delegate/mock_tab_opener.h

Index: ios/chrome/app/application_delegate/mock_tab_opener.h
diff --git a/ios/chrome/app/application_delegate/mock_tab_opener.h b/ios/chrome/app/application_delegate/mock_tab_opener.h
index fd1e8bec7ff4433a98c7ca65c4f864d0d52309fc..26ecaac7e46d44f9815a175cab076d03e8661e0c 100644
--- a/ios/chrome/app/application_delegate/mock_tab_opener.h
+++ b/ios/chrome/app/application_delegate/mock_tab_opener.h
@@ -18,7 +18,7 @@ class GURL;
 // -dismissModalsAndOpenSelectedTabInMode:withURL:transition:completion:.
 @property(nonatomic, readonly) GURL url;
 @property(nonatomic, readonly) ApplicationMode applicationMode;
-@property(nonatomic, readonly) void (^completionBlock)(void);
+@property(weak, nonatomic, readonly) void (^completionBlock)(void);

[sdefresne, 2017/02/21 09:42:40]

This is incoherent with the code the property was a ScopedBlock, so not weak but
strong.

[stkhapugin, 2017/02/21 12:53:01]

Done.

 
 // Clear the URL.
 - (void)resetURL;