Revert of Simplify BrowserContext by removing redundant methods.

blimp/engine/common/blimp_browser_context.cc

Index: blimp/engine/common/blimp_browser_context.cc
diff --git a/blimp/engine/common/blimp_browser_context.cc b/blimp/engine/common/blimp_browser_context.cc
index 8e8baa81d41255ff0084aa1a908cf26dccf3fa65..614bd494e253a59addf58722729a7856cf213293 100644
--- a/blimp/engine/common/blimp_browser_context.cc
+++ b/blimp/engine/common/blimp_browser_context.cc
@@ -105,21 +105,25 @@
   return system_context_getter_.get();
 }
 
+net::URLRequestContextGetter* BlimpBrowserContext::GetRequestContext() {
+  return GetDefaultStoragePartition(this)->GetURLRequestContext();
+}
+
 net::URLRequestContextGetter* BlimpBrowserContext::GetMediaRequestContext() {
-  return resource_context_->url_request_context_getter().get();
+  return GetRequestContext();
 }
 
 net::URLRequestContextGetter*
 BlimpBrowserContext::GetMediaRequestContextForRenderProcess(
     int renderer_child_id) {
-  return resource_context_->url_request_context_getter().get();
+  return GetRequestContext();
 }
 
 net::URLRequestContextGetter*
 BlimpBrowserContext::GetMediaRequestContextForStoragePartition(
     const base::FilePath& partition_path,
     bool in_memory) {
-  return resource_context_->url_request_context_getter().get();
+  return GetRequestContext();
 }
 
 content::ResourceContext* BlimpBrowserContext::GetResourceContext() {