Move indexed db files from content/renderer to content/common.

content/common/child_thread.cc

Index: content/common/child_thread.cc
diff --git a/content/common/child_thread.cc b/content/common/child_thread.cc
index 9152a447e2db70c07776b06cdee9f5c92ece54ff..be8866ced3e5400cd9dd4fd54a726141cf7c3593 100644
--- a/content/common/child_thread.cc
+++ b/content/common/child_thread.cc
@@ -252,6 +252,11 @@ ChildThread* ChildThread::current() {
   return ChildProcess::current()->main_thread();
 }
 
+bool ChildThread::IsWebFrameValid(WebKit::WebFrame* frame) {
+  // Return false so that it is overridden in any process in which it is used.
+  return false;
+}
+
 void ChildThread::OnProcessFinalRelease() {
   if (on_channel_error_called_) {
     MessageLoop::current()->Quit();