mash: Rename browser_driver to app_driver.

mash/app_driver/BUILD.gn

Index: mash/app_driver/BUILD.gn
diff --git a/mash/browser_driver/BUILD.gn b/mash/app_driver/BUILD.gn
similarity index 85%
rename from mash/browser_driver/BUILD.gn
rename to mash/app_driver/BUILD.gn
index 2b42fc5554ff6d88533ea7b38658e36d36a8d965..758b3089e04b7722b205da25a99847116fc1da0c 100644
--- a/mash/browser_driver/BUILD.gn
+++ b/mash/app_driver/BUILD.gn
@@ -10,8 +10,8 @@ import("//tools/grit/repack.gni")
 
 source_set("lib") {
   sources = [
-    "browser_driver_application_delegate.cc",
-    "browser_driver_application_delegate.h",
+    "app_driver_application_delegate.cc",
+    "app_driver_application_delegate.h",
   ]
 
   deps = [
@@ -28,7 +28,7 @@ source_set("lib") {
   ]
 }
 
-mojo_native_application("browser_driver") {
+mojo_native_application("app_driver") {
   sources = [
     "main.cc",
   ]
@@ -47,6 +47,6 @@ mojo_native_application("browser_driver") {
 }
 
 mojo_application_manifest("manifest") {
-  application_name = "browser_driver"
+  application_name = "app_driver"
   source = "manifest.json"
 }