Fix tweak_info_plist.py to be explicit about arguments.

content/shell/shell_main_delegate.cc

Index: content/shell/shell_main_delegate.cc
diff --git a/content/shell/shell_main_delegate.cc b/content/shell/shell_main_delegate.cc
index 0a3977b1f641dba7740aca5a95cc40b236e0487d..90e2b9756905097f0ea750d97afb6669ab974499 100644
--- a/content/shell/shell_main_delegate.cc
+++ b/content/shell/shell_main_delegate.cc
@@ -7,6 +7,7 @@
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/path_service.h"
+#include "content/public/common/content_paths.h"
 #include "content/public/common/content_switches.h"
 #include "content/shell/shell_content_browser_client.h"
 #include "content/shell/shell_content_plugin_client.h"
@@ -16,6 +17,42 @@
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
 
+#if defined(OS_MACOSX)
+#include "base/mac/foundation_util.h"
+#endif
+
+#if defined(OS_MACOSX)
+namespace {
+
+void OverrideChildProcessPath() {
+  if (base::mac::IsBackgroundOnlyProcess()) {
+    // The background-only process is the helper; no overriding needed.
+    return;
+  }
+
+  // Start out with the path to the running executable.
+  FilePath helper_path;
+  PathService::Get(base::FILE_EXE, &helper_path);
+
+  // One step up to MacOS, another to Contents.
+  helper_path = helper_path.DirName().DirName();
+  DCHECK_EQ(helper_path.BaseName().value(), "Contents");
+
+  // Go into the frameworks directory.
+  helper_path = helper_path.Append("Frameworks");
+
+  // And the app path.
+  helper_path = helper_path.Append("Content Shell Helper.app")
+                           .Append("Contents")
+                           .Append("MacOS")
+                           .Append("Content Shell Helper");
+
+  PathService::Override(content::CHILD_PROCESS_EXE, helper_path);
+}
+
+}
+#endif  // OS_MACOSX
+
 ShellMainDelegate::ShellMainDelegate() {
 }
 
@@ -27,6 +64,10 @@ bool ShellMainDelegate::BasicStartupComplete(int* exit_code) {
 }
 
 void ShellMainDelegate::PreSandboxStartup() {
+#if defined(OS_MACOSX)
+  OverrideChildProcessPath();
+#endif  // OS_MACOSX
+
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   std::string process_type =
       command_line.GetSwitchValueASCII(switches::kProcessType);