Widen one suppression (bug 40429), fix styling nits in two other suppressions...

tools/valgrind/memcheck/suppressions_mac.txt

 # There are three kinds of suppressions in this file:
 # 1. Third party stuff we have no control over.
 #
 # 2. Intentional unit test errors, 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.
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 222 matching lines @@
 {
    # jrg thinks this is probably a bug in Cocoa but is harmless.  We
    # can hit it by using --homepage=about:blank, which triggers a
    # location bar focus earlier than normal (earlier than when a
    # window is shown).  To "work around" the problem for valgrind, we
    # could call for example call [NSWindow setInitialFirstResponder:]
    # instead of [NSWindow makeFirstResponder:] if the window isn't
    # visible.  However, these contortions are ugly.  since the
    # needsDisplay region gets reset when the window is shown, it
    # really doesn't matter what we do with it before then.
+   Mac_NSIsEmptyRect_Cond
    Memcheck:Cond
    fun:NSIsEmptyRect
    fun:-[NSRegion isEmpty]
    fun:-[NSRegion subtractRegion:]
    fun:-[NSWindow _subtractFromNeedsDisplayRegion:]
    ...
    fun:-[NSWindow makeKeyAndOrderFront:]
    fun:_ZN18BrowserWindowCocoa4ShowEv
    ...
    fun:_ZN11BrowserInit17LaunchWithProfile17OpenURLsInBrowserEP7BrowserbRKSt6vectorI4GURLSaIS4_EE
    ...
    fun:ChromeMain
    fun:main
 }
 {
    # Same as above -- touching a region we'll throw away soon.
+   Mac_NSUnionRect_Cond
    Memcheck:Cond
    fun:NSUnionRect
    fun:-[NSRegion addRect:]
    ...
    fun:-[AutocompleteTextField becomeFirstResponder]
    fun:-[NSWindow makeFirstResponder:]
    fun:_ZN23AutocompleteEditViewMac13FocusLocationEb
    ...
    fun:_ZN13TabStripModel14AddTabContentsEP11TabContentsiji
 }
@@ skipping 453 matching lines @@
    fun:_CFRuntimeCreateInstance
    fun:__CFDictionaryInit
    fun:CFDictionaryCreate
    fun:classDescription
    fun:classDescription
    fun:propertyInfoForSelector
    fun:CAObject_resolveInstanceMethod
    fun:_class_resolveMethod
    fun:_class_lookupMethodAndLoadCache
    fun:objc_msgSend
-
    fun:_ZN15StatusBubbleMac9SetStatusERKSbIwSt11char_traitsIwESaIwEE
    fun:_ZN7Browser13TabSelectedAtEP11TabContentsS1_ib
    fun:_ZN13TabStripModel26ChangeSelectedContentsFromEP11TabContentsib
    fun:_ZN13TabStripModel19InsertTabContentsAtEiP11TabContentsbb
    fun:_ZN13TabStripModel14AddTabContentsEP11TabContentsibjb
    fun:_ZN7Browser13AddTabWithURLERK4GURLS2_jbibP12SiteInstance
    fun:_ZN11BrowserInit17LaunchWithProfile17OpenURLsInBrowserEP7BrowserbRKSt6vectorI4GURLSaIS4_EE
    fun:_ZN11BrowserInit17LaunchWithProfile6LaunchEP7Profileb
    fun:_ZN12_GLOBAL__N_113LaunchBrowserERK11CommandLineP7ProfileRKSbIwSt11char_traitsIwESaIwEEbPiP11BrowserInit
    fun:_ZN11BrowserInit18ProcessCmdLineImplERK11CommandLineRKSbIwSt11char_traitsIwESaIwEEbP7ProfilePiPS_
@@ skipping 260 matching lines @@
    fun:_decodeObjectBinary
    fun:-[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:]
    fun:-[NSArray(NSArray) initWithCoder:]
    fun:_decodeObjectBinary
    fun:_decodeObject
    fun:-[NSView initWithCoder:]
    fun:_decodeObjectBinary
    fun:_decodeObject
    fun:-[NSResponder initWithCoder:]
    fun:-[NSView initWithCoder:]
-   fun:-[NSControl initWithCoder:]
 }
 {
    bug_40585
    Memcheck:Param
    socketcall.sendmsg(msg.msg_iov[i])
    fun:sendmsg$UNIX2003
    fun:_ZN3IPC7Channel11ChannelImpl28OnFileCanReadWithoutBlockingEi
    fun:_ZN4base19MessagePumpLibevent22OnLibeventNotificationEisPv
    fun:event_process_active
    fun:event_base_loop
@@ skipping 526 matching lines @@
    bug_50638
    Memcheck:Cond
    fun:gleUpdateViewScissorData
    ...
    fun:cgl_set_surface
    fun:ogl_attach_surface
    fun:ogl_render_fade_transition
    fun:ogl_render_layer_
    fun:ogl_render_layers
 }