Purge new localstorage memory cache when under memory pressure.

content/browser/dom_storage/dom_storage_context_wrapper.cc

Index: content/browser/dom_storage/dom_storage_context_wrapper.cc
diff --git a/content/browser/dom_storage/dom_storage_context_wrapper.cc b/content/browser/dom_storage/dom_storage_context_wrapper.cc
index fe0fa5fcf73ce9e2f8549a87cdf5e39a00962fbe..be4ffb4c0b619f129745bb2b14a1d742ccb5f950 100644
--- a/content/browser/dom_storage/dom_storage_context_wrapper.cc
+++ b/content/browser/dom_storage/dom_storage_context_wrapper.cc
@@ -285,6 +285,8 @@ void DOMStorageContextWrapper::PurgeMemory(DOMStorageContextImpl::PurgeOption
   context_->task_runner()->PostTask(
       FROM_HERE,
       base::Bind(&DOMStorageContextImpl::PurgeMemory, context_, purge_option));
+  if (mojo_state_ && purge_option == DOMStorageContextImpl::PURGE_AGGRESSIVE)
+    mojo_state_->PurgeMemory();
 }
 
 void DOMStorageContextWrapper::GotMojoLocalStorageUsage(