Remove more unnecessary ChromeURLRequestContext members.

tools/valgrind/memcheck/suppressions.txt

 # There are three kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 3613 matching lines @@
    fun:_ZN13ProfileIOData23InitializeProfileParamsEP7Profile
 }
 {
    bug_72698_b
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZNK13ProfileIOData14LazyInitializeEv
 }
 {
+   bug_72698_c
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN17ProfileImplIOData6HandleC1EP7Profile
+   fun:_ZN11ProfileImplC1ERK8FilePathPN7Profile8DelegateE
+}
+{
    bug_73000
    Memcheck:Cond
    fun:clipboard_clipboard_buffer_received
    ...
    fun:gtk_text_view_key_press_event
    fun:_ZN14OmniboxViewGtk14HandleKeyPressEP10_GtkWidgetP12_GdkEventKey
 }
 {
    bug_73132
    Memcheck:Leak
@@ skipping 1227 matching lines @@
 {
    bug_todo_getdelim2
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }