diff --git content/browser/blob_storage/chrome_blob_storage_context.cc content/browser/blob_storage/chrome_blob_storage_context.cc
index 5610c0df1c7d..0f2ed42e6451 100644
--- content/browser/blob_storage/chrome_blob_storage_context.cc
+++ content/browser/blob_storage/chrome_blob_storage_context.cc
@@ -117,7 +117,8 @@ ChromeBlobStorageContext* ChromeBlobStorageContext::GetFor(
 
     // If we're not incognito mode, schedule all of our file tasks to enable
     // disk on the storage context.
-    if (!context->IsOffTheRecord() && io_thread_valid) {
+    if (!context->GetPath().empty() && !context->IsOffTheRecord() &&
+        io_thread_valid) {
       file_task_runner = base::CreateTaskRunnerWithTraits(
           {base::MayBlock(), base::TaskPriority::BEST_EFFORT,
            base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN});
diff --git content/browser/browser_context.cc content/browser/browser_context.cc
index b2b3920da3b0..686afc464b42 100644
--- content/browser/browser_context.cc
+++ content/browser/browser_context.cc
@@ -56,6 +56,7 @@
 #include "content/public/common/content_switches.h"
 #include "content/public/common/service_manager_connection.h"
 #include "content/public/common/service_names.mojom.h"
+#include "media/capabilities/in_memory_video_decode_stats_db_impl.h"
 #include "media/capabilities/video_decode_stats_db_impl.h"
 #include "media/mojo/services/video_decode_perf_history.h"
 #include "net/cookies/cookie_store.h"
@@ -211,7 +212,7 @@ StoragePartition* GetStoragePartitionFromConfig(
   StoragePartitionImplMap* partition_map =
       GetStoragePartitionMap(browser_context);
 
-  if (browser_context->IsOffTheRecord())
+  if (browser_context->IsOffTheRecord() || browser_context->GetPath().empty())
     in_memory = true;
 
   return partition_map->Get(partition_domain, partition_name, in_memory,
@@ -790,9 +791,14 @@ media::VideoDecodePerfHistory* BrowserContext::GetVideoDecodePerfHistory() {
   // occurs later upon first VideoDecodePerfHistory API request that requires DB
   // access. DB operations will not block the UI thread.
   if (!decode_history) {
-    std::unique_ptr<media::VideoDecodeStatsDBImpl> stats_db =
-        media::VideoDecodeStatsDBImpl::Create(
-            GetPath().Append(FILE_PATH_LITERAL("VideoDecodeStats")));
+    std::unique_ptr<media::VideoDecodeStatsDB> stats_db;
+    if (GetPath().empty()) {
+      stats_db =
+          std::make_unique<media::InMemoryVideoDecodeStatsDBImpl>(nullptr);
+    } else {
+      stats_db = media::VideoDecodeStatsDBImpl::Create(
+          GetPath().Append(FILE_PATH_LITERAL("VideoDecodeStats")));
+    }
     auto new_decode_history = std::make_unique<media::VideoDecodePerfHistory>(
         std::move(stats_db), BrowserFeatureProvider::GetFactoryCB());
     decode_history = new_decode_history.get();
diff --git content/browser/renderer_host/render_process_host_impl.cc content/browser/renderer_host/render_process_host_impl.cc
index 9f2665f0587c..514ec596582d 100644
--- content/browser/renderer_host/render_process_host_impl.cc
+++ content/browser/renderer_host/render_process_host_impl.cc
@@ -2205,6 +2205,9 @@ void RenderProcessHostImpl::RegisterMojoInterfaces() {
     plugin_registry_.reset(
         new PluginRegistryImpl(GetBrowserContext()->GetResourceContext()));
   }
+  // Needed for proper routing of IsPluginAvailable callbacks.
+  DCHECK_GE(GetID(), 0);
+  plugin_registry_->set_render_process_id(GetID());
   registry->AddInterface(base::BindRepeating(
       &PluginRegistryImpl::Bind, base::Unretained(plugin_registry_.get())));
 #endif
diff --git storage/browser/database/database_tracker.cc storage/browser/database/database_tracker.cc
index 18f8b0a11438..a10ab23aaceb 100644
--- storage/browser/database/database_tracker.cc
+++ storage/browser/database/database_tracker.cc
@@ -509,7 +509,7 @@ bool DatabaseTracker::LazyInit() {
     meta_table_.reset(new sql::MetaTable());
 
     is_initialized_ =
-        base::CreateDirectory(db_dir_) &&
+        (is_incognito_ ? true : base::CreateDirectory(db_dir_)) &&
         (db_->is_open() ||
          (is_incognito_ ? db_->OpenInMemory() :
           db_->Open(kTrackerDatabaseFullPath))) &&