Use CommandLine when launching Chrome from gcapi. Path may contain spaces for some partners.

chrome/installer/gcapi/gcapi.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // NOTE: This code is a legacy utility API for partners to check whether
 //       Chrome can be installed and launched. Recent updates are being made
 //       to add new functionality. These updates use code from Chromium, the old
 //       coded against the win32 api directly. If you have an itch to shave a
 //       yak, feel free to re-write the old code too.
 
@@ skipping 485 matching lines @@
       }
       ::LocalFree(exp_proc_sid);
     }
 
     ::LocalFree(curr_proc_sid);
     if (!impersonation_success) {
       return false;
     }
   }
 
+  CommandLine chrome_command(chrome_exe_path);
+
   bool ret = false;
   ScopedComPtr<IProcessLauncher> ipl;
   if (SUCCEEDED(ipl.CreateInstance(__uuidof(ProcessLauncherClass),
                                    NULL,
                                    CLSCTX_LOCAL_SERVER))) {
-    if (SUCCEEDED(ipl->LaunchCmdLine(chrome_exe_path.value().c_str())))
+    if (SUCCEEDED(ipl->LaunchCmdLine(
+            chrome_command.GetCommandLineString().c_str())))
       ret = true;
     ipl.Release();
   } else {
     // Couldn't get Omaha's process launcher, Omaha may not be installed at
     // system level. Try just running Chrome instead.
-    ret = base::LaunchProcess(chrome_exe_path.value(),
+    ret = base::LaunchProcess(chrome_command.GetCommandLineString(),
                               base::LaunchOptions(),
                               NULL);
   }
 
   if (impersonation_success)
     ::RevertToSelf();
   return ret;
 }
 
 BOOL __stdcall LaunchGoogleChromeWithDimensions(int x,
@@ skipping 258 matching lines @@
       key.WriteValue(kRelaunchAllowedAfterValue,
                      FormatDateOffsetByMonths(6)) != ERROR_SUCCESS ||
       !SetRelaunchExperimentLabels(relaunch_brandcode, shell_mode)) {
     if (error_code)
       *error_code = RELAUNCH_ERROR_RELAUNCH_FAILED;
     return FALSE;
   }
 
   return TRUE;
 }