A quick fix for Issue 26880....

chrome/browser/renderer_host/render_widget_host_view_mac.mm

Index: chrome/browser/renderer_host/render_widget_host_view_mac.mm
===================================================================
--- chrome/browser/renderer_host/render_widget_host_view_mac.mm	(revision 31543)
+++ chrome/browser/renderer_host/render_widget_host_view_mac.mm	(working copy)
@@ -4,6 +4,10 @@
 
 #include "chrome/browser/renderer_host/render_widget_host_view_mac.h"
 
+#import <Carbon/Carbon.h>
+#include <ApplicationServices/ApplicationServices.h>
+#include <AvailabilityMacros.h>
+
 #include "base/histogram.h"
 #import "base/scoped_nsobject.h"
 #include "base/string_util.h"
@@ -232,7 +236,14 @@
 void RenderWidgetHostViewMac::IMEUpdateStatus(int control,
                                               const gfx::Rect& caret_rect) {
   // The renderer updates its IME status.
-  // We need to control the input method according to the given message.
+#if MAC_OS_X_VERSION_MIN_REQUIRED <= MAC_OS_X_VERSION_10_5
+  // Complete the ongoing composition when a renderer finishes it.
+  // We need to use Carbon APIs to finish an ongoing composition since Leopard
+  // doesn't implement a Cocoa API -[NSTextInputContext discardMarkedText:]
+  // that discards the marked text.
+  if (control == IME_DISABLE || control == IME_COMPLETE_COMPOSITION)
+    ::FixTSMDocument(::TSMGetActiveDocument());
+#endif
 
   // We need to convert the coordinate of the cursor rectangle sent from the
   // renderer and save it. Our IME backend uses a coordinate system whose
@@ -573,26 +584,26 @@
   // http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/EventOverview/HandlingKeyEvents/HandlingKeyEvents.html
   // ). We only want to handle key equivalents if we're first responder.
   if ([[self window] firstResponder] != self)
-    return NO;	
+    return NO;
 
-  // If we return |NO| from this function, cocoa will send the key event to	
-  // the menu and only if the menu does not process the event to |keyDown:|. We	
-  // want to send the event to a renderer _before_ sending it to the menu, so	
-  // we need to return |YES| for all events that might be swallowed by the menu.	
-  // We do not return |YES| for every keypress because we don't get |keyDown:|	
-  // events for keys that we handle this way.	
-  NSUInteger modifierFlags = [theEvent modifierFlags];	
-  if ((modifierFlags & NSCommandKeyMask) == 0) {	
-    // Make sure the menu does not contain key equivalents that don't	
-    // contain cmd.	
-    DCHECK(![[NSApp mainMenu] performKeyEquivalent:theEvent]);	
-    return NO;	
+  // If we return |NO| from this function, cocoa will send the key event to
+  // the menu and only if the menu does not process the event to |keyDown:|. We
+  // want to send the event to a renderer _before_ sending it to the menu, so
+  // we need to return |YES| for all events that might be swallowed by the menu.
+  // We do not return |YES| for every keypress because we don't get |keyDown:|
+  // events for keys that we handle this way.
+  NSUInteger modifierFlags = [theEvent modifierFlags];
+  if ((modifierFlags & NSCommandKeyMask) == 0) {
+    // Make sure the menu does not contain key equivalents that don't
+    // contain cmd.
+    DCHECK(![[NSApp mainMenu] performKeyEquivalent:theEvent]);
+    return NO;
   }
 
-  // Command key combinations are sent via performKeyEquivalent rather than	
-  // keyDown:. We just forward this on and if WebCore doesn't want to handle	
-  // it, we let the TabContentsView figure out how to reinject it.	
-  [self keyEvent:theEvent wasKeyEquivalent:YES];	
+  // Command key combinations are sent via performKeyEquivalent rather than
+  // keyDown:. We just forward this on and if WebCore doesn't want to handle
+  // it, we let the TabContentsView figure out how to reinject it.
+  [self keyEvent:theEvent wasKeyEquivalent:YES];
   return YES;
 }
 
@@ -609,14 +620,14 @@
 }
 
 - (void)keyEvent:(NSEvent*)theEvent {
-  [self keyEvent:theEvent wasKeyEquivalent:NO];	
-}	
+  [self keyEvent:theEvent wasKeyEquivalent:NO];
+}
 
-- (void)keyEvent:(NSEvent *)theEvent wasKeyEquivalent:(BOOL)equiv {	
+- (void)keyEvent:(NSEvent *)theEvent wasKeyEquivalent:(BOOL)equiv {
   if (ignoreKeyEvents_)
     return;
 
-  DCHECK([theEvent type] != NSKeyDown ||	
+  DCHECK([theEvent type] != NSKeyDown ||
          !equiv == !([theEvent modifierFlags] & NSCommandKeyMask));
 
   scoped_nsobject<RenderWidgetHostViewCocoa> keepSelfAlive([self retain]);