Provide API in RequestCoordinator to remove results by client ID.

components/offline_pages/background/request_queue_in_memory_store.cc

Index: components/offline_pages/background/request_queue_in_memory_store.cc
diff --git a/components/offline_pages/background/request_queue_in_memory_store.cc b/components/offline_pages/background/request_queue_in_memory_store.cc
index defb87e311ffed9c84328e47b31764f9da3d00d9..1aeeee91728e0db855663f82c1397b8e20219b1e 100644
--- a/components/offline_pages/background/request_queue_in_memory_store.cc
+++ b/components/offline_pages/background/request_queue_in_memory_store.cc
@@ -39,7 +39,7 @@ void RequestQueueInMemoryStore::RemoveRequests(
     const std::vector<int64_t>& request_ids,
     const RemoveCallback& callback) {
   // In case the |request_ids| is empty, the result will be true, but the count
-  // of deleted pages will be empty.
+  // of deleted pages will be 0.
   int count = 0;
   RequestsMap::iterator iter;
   for (auto request_id : request_ids) {
@@ -54,6 +54,34 @@ void RequestQueueInMemoryStore::RemoveRequests(
       FROM_HERE, base::Bind(callback, true, count));
 }
 
+void RequestQueueInMemoryStore::RemoveRequestsByClientId(
+    const std::vector<ClientId>& client_ids,
+    const RemoveCallback& callback) {
+  // In case the |client_ids| is empty, the result will be true, but the count
+  // of deleted pages will be 0.
+  int count = 0;
+
+  // Once for each client id in our list
+  for (auto client_id : client_ids) {
+    // Check it against each request in the store.
+    for (auto iter = requests_.begin();
+         iter != requests_.end();
+         ++iter) {
+      // Check against each incoming client ID, and delete if we have a match.
+      if ((*iter).second.client_id() == client_id) {
+        requests_.erase(iter);
+        // This delete will invalidate the iterator, so move on to the next
+        // entry.
+        ++count;
+        break;
+      }
+    }
+  }
+
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::Bind(callback, true, count));
+}
+
 void RequestQueueInMemoryStore::Reset(const ResetCallback& callback) {
   requests_.clear();
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,