[Fuchsia] Remove package detection in base::PathProviderFuchsia()

Previously PathProvider was trying to detect if it's packaged or not.
That logic is no longer needed because we can assume that all binaries
produced in chromium are packaged.

Change-Id: I963afac5342d44b8d8188c07ffb927d6b4fac271
Reviewed-on: https://chromium-review.googlesource.com/1134586
Commit-Queue: Sergey Ulanov <[email protected]>
Reviewed-by: Wez <[email protected]>
Cr-Original-Commit-Position: refs/heads/master@{#574684}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 4f9d9e774d5d41a5d8073b156348eee4bde25753

base_paths_fuchsia.cc

@@ -13,22 +13,9 @@
 #include "base/process/process.h"
 
 namespace base {
-namespace {
-
-constexpr char kPackageRoot[] = "/pkg";
-
-}  // namespace
 
 base::FilePath GetPackageRoot() {
-  base::FilePath path_obj(kPackageRoot);
-
-  // Fuchsia's appmgr will set argv[0] to a fully qualified executable path
-  // under /pkg for packaged binaries.
-  if (path_obj.IsParent(base::CommandLine::ForCurrentProcess()->GetProgram())) {
-    return path_obj;
-  } else {
-    return base::FilePath();
-  }
+  return base::FilePath("/pkg");
 }
 
 bool PathProviderFuchsia(int key, FilePath* result) {
@@ -39,9 +26,6 @@ bool PathProviderFuchsia(int key, FilePath* result) {
     case FILE_EXE:
       *result = CommandLine::ForCurrentProcess()->GetProgram();
       return true;
-    case DIR_SOURCE_ROOT:
-      *result = GetPackageRoot();
-      return true;
     case DIR_APP_DATA:
       // TODO(https://crbug.com/840598): Switch to /data when minfs supports
       // mmap().
@@ -53,6 +37,7 @@ bool PathProviderFuchsia(int key, FilePath* result) {
       *result = FilePath("/data");
       return true;
     case DIR_ASSETS:
+    case DIR_SOURCE_ROOT:
       *result = GetPackageRoot();
       return true;
   }