Adds support for media permission request handling on <appview> tag.

extensions/shell/browser/shell_extensions_browser_client.cc

Index: extensions/shell/browser/shell_extensions_browser_client.cc
diff --git a/extensions/shell/browser/shell_extensions_browser_client.cc b/extensions/shell/browser/shell_extensions_browser_client.cc
index e4006f1d8ad688197991d5d431744b6f52d5f6b3..d418e56b883bd44f966d2107ff83dfa2e65c3c20 100644
--- a/extensions/shell/browser/shell_extensions_browser_client.cc
+++ b/extensions/shell/browser/shell_extensions_browser_client.cc
@@ -16,6 +16,7 @@
 #include "extensions/shell/browser/api/generated_api_registration.h"
 #include "extensions/shell/browser/shell_extension_host_delegate.h"
 #include "extensions/shell/browser/shell_extension_system_factory.h"
+#include "extensions/shell/browser/shell_extensions_api_client.h"
 #include "extensions/shell/browser/shell_runtime_api_delegate.h"
 
 using content::BrowserContext;
@@ -28,7 +29,7 @@ ShellExtensionsBrowserClient::ShellExtensionsBrowserClient(
     PrefService* pref_service)
     : browser_context_(context),
       pref_service_(pref_service),
-      api_client_(new ExtensionsAPIClient),
+      api_client_(new ShellExtensionsAPIClient),
       extension_cache_(new NullExtensionCache()) {
 }
 
@@ -214,4 +215,9 @@ bool ShellExtensionsBrowserClient::IsMinBrowserVersionSupported(
   return true;
 }
 
+void ShellExtensionsBrowserClient::SetAPIClientForTest(
+    ExtensionsAPIClient* api_client) {
+  api_client_.reset(api_client);
+}
+
 }  // namespace extensions