-Wuninitialized fixes

base/message_loop.cc

Index: base/message_loop.cc
diff --git a/base/message_loop.cc b/base/message_loop.cc
index d83adccec08b56f8cdeb991c1b06af60d7a877e0..5e2cbcee5c9df1263c8585ffcf43cf66d1d29cab 100644
--- a/base/message_loop.cc
+++ b/base/message_loop.cc
@@ -165,7 +165,7 @@ MessageLoop::~MessageLoop() {
   // tasks.  Normally, we should only pass through this loop once or twice.  If
   // we end up hitting the loop limit, then it is probably due to one task that
   // is being stubborn.  Inspect the queues to see who is left.
-  bool did_work;
+  bool did_work = false;  // clang pr9061
   for (int i = 0; i < 100; ++i) {
     DeletePendingTasks();
     ReloadWorkQueue();