Implement origin-based deletion for the domain reliability service.

components/domain_reliability/context_manager.cc

Index: components/domain_reliability/context_manager.cc
diff --git a/components/domain_reliability/context_manager.cc b/components/domain_reliability/context_manager.cc
index 54d5eaa176e7f978770bec4df59c9f2b2565d3d0..bcdb530de64d7b639438cf5a11e4fec6af57598c 100644
--- a/components/domain_reliability/context_manager.cc
+++ b/components/domain_reliability/context_manager.cc
@@ -14,7 +14,8 @@ DomainReliabilityContextManager::DomainReliabilityContextManager(
 }
 
 DomainReliabilityContextManager::~DomainReliabilityContextManager() {
-  RemoveAllContexts();
+  RemoveContexts(
+      base::Callback<bool(const GURL&)>() /* no filter - delete everything */);
 }
 
 void DomainReliabilityContextManager::RouteBeacon(
@@ -69,9 +70,14 @@ void DomainReliabilityContextManager::ClearConfig(const GURL& origin) {
   }
 }
 
-void DomainReliabilityContextManager::ClearBeaconsInAllContexts() {
-  for (auto& context_entry : contexts_)
-    context_entry.second->ClearBeacons();
+void DomainReliabilityContextManager::ClearBeacons(
+    const base::Callback<bool(const GURL&)>& origin_filter) {
+  for (auto& context_entry : contexts_) {
+    if (origin_filter.is_null() ||
+        origin_filter.Run(context_entry.second->config().origin)) {
+      context_entry.second->ClearBeacons();
+    }
+  }
 }
 
 DomainReliabilityContext* DomainReliabilityContextManager::AddContextForConfig(
@@ -89,10 +95,18 @@ DomainReliabilityContext* DomainReliabilityContextManager::AddContextForConfig(
   return *entry;
 }
 
-void DomainReliabilityContextManager::RemoveAllContexts() {
-  STLDeleteContainerPairSecondPointers(
-      contexts_.begin(), contexts_.end());
-  contexts_.clear();
+void DomainReliabilityContextManager::RemoveContexts(
+    const base::Callback<bool(const GURL&)>& origin_filter) {
+  for (ContextMap::iterator it = contexts_.begin(); it != contexts_.end(); ) {
+    if (!origin_filter.is_null() &&
+        !origin_filter.Run(it->second->config().origin)) {
+      ++it;
+      continue;
+    }
+
+    delete it->second;
+    it = contexts_.erase(it);
+  }
 }
 
 std::unique_ptr<base::Value> DomainReliabilityContextManager::GetWebUIData()