base: Remove the string logging from CHECK().

content/public/browser/browser_child_process_host_iterator.cc

Index: content/public/browser/browser_child_process_host_iterator.cc
diff --git a/content/public/browser/browser_child_process_host_iterator.cc b/content/public/browser/browser_child_process_host_iterator.cc
index a2aa0473b6f373d1f918ade89ded861a6f4eebdc..e94775fb26d2a9ce9f31ba9ea427858b6e4d66fb 100644
--- a/content/public/browser/browser_child_process_host_iterator.cc
+++ b/content/public/browser/browser_child_process_host_iterator.cc
@@ -12,15 +12,15 @@ namespace content {
 
 BrowserChildProcessHostIterator::BrowserChildProcessHostIterator()
     : all_(true), process_type_(PROCESS_TYPE_UNKNOWN) {
-  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)) <<
-      "BrowserChildProcessHostIterator must be used on the IO thread.";
+  // BrowserChildProcessHostIterator must be used on the IO thread.
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   iterator_ = BrowserChildProcessHostImpl::GetIterator()->begin();
 }
 
 BrowserChildProcessHostIterator::BrowserChildProcessHostIterator(int type)
     : all_(false), process_type_(type) {
-  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)) <<
-      "BrowserChildProcessHostIterator must be used on the IO thread.";
+  // BrowserChildProcessHostIterator must be used on the IO thread.
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK_NE(PROCESS_TYPE_RENDERER, type) <<
       "BrowserChildProcessHostIterator doesn't work for renderer processes; "
       "try RenderProcessHost::AllHostsIterator() instead.";