Use a valid /prefetch argument when launching a process.

components/crash.gypi

Index: components/crash.gypi
diff --git a/components/crash.gypi b/components/crash.gypi
index 2e5cf2429f5f8eb328be347eedaf3f4fa0dc8727..c7f7a788c303b397887df7a4d18704de8cf73e8f 100644
--- a/components/crash.gypi
+++ b/components/crash.gypi
@@ -218,6 +218,13 @@
           ],
           'defines': ['CRASH_IMPLEMENTATION'],
           'conditions': [
+            ['OS=="win"', {
+              'dependencies': [
+                # TODO(fdoray): Remove this once the PreRead field trial has
+                # expired. crbug.com/577698
+                '<(DEPTH)/components/components.gyp:startup_metric_utils_common',
+              ],
+            }],
             ['OS=="mac" or OS=="win"', {
               'dependencies': [
                 '../third_party/crashpad/crashpad/client/client.gyp:crashpad_client',