Explicit cast to remove warning.

Author: RomainMuller

PBWebHistoryController.m

@@ -122,7 +122,7 @@ - (void)commitDetailsLoaded:(NSNotification *)notification
 	[[view windowScriptObject] callWebScriptMethod:@"showCommit" withArguments:[NSArray arrayWithObject:html]];
 
 #ifdef DEBUG_BUILD
-	NSString *dom=[[[[view mainFrame] DOMDocument] documentElement] outerHTML];
+	NSString *dom=[(DOMHTMLElement*)[[[view mainFrame] DOMDocument] documentElement] outerHTML];
 	NSString *tmpFile=@"~/tmp/test2.html";
 	[dom writeToFile:[tmpFile stringByExpandingTildeInPath] atomically:true encoding:NSUTF8StringEncoding error:nil];
 #endif