Problem trying to find a bug number in git commit messages

[Lee Doolan]

I have  noticed that I cannot locate some BUG numbers in the git commit history.

consider this issue:

    https://bugs.chromium.org/p/chromium/issues/detail?id=49317

If you click on that link you will see an issue report which contains this:

    The following revision refers to this bug:

        http://src.chromium.org/viewvc/chrome?view=rev&revision=52678 

clicking on that link will show you a log message like this:

,----

| Log Message:

| Merge 60984 - 2010-06-10  Tony Chang  <to...@chromium.org>

| 

|         Reviewed by Kent Tamura.

| 

|         crash when focus is changed while trying to focus next element

|         https://bugs.webkit.org/show_bug.cgi?id=40407

| 

|         * fast/events/focus-change-crash-expected.txt: Added.

|         * fast/events/focus-change-crash.html: Added.

| 2010-06-10  Tony Chang  <to...@chromium.org>

| 

|         Reviewed by Kent Tamura.

| 

|         crash when focus is changed while trying to focus next element

|         https://bugs.webkit.org/show_bug.cgi?id=40407

| 

|         Test: fast/events/focus-change-crash.html

| 

|         * dom/Element.cpp:

|         (WebCore::Element::focus):

| 

| 

| BUG=49317

| 

| Review URL: http://codereview.chromium.org/2881019

`----

When I look for the corresponding commit message in the git repository 

(that I cloned like this http://www.chromium.org/developers/how-tos/get-the-code)

I see this:

,----

| commit 7ba74ad86e33c4feb4c26b3267177ac70cb5abae

| Author: to...@chromium.org <to...@chromium.org@bbb929c8-8fbe-4397-9dbb-9b2b20218538>

| Date:   Fri Jun 11 00:49:10 2010 +0000

| 

|     2010-06-10  Tony Chang  <to...@chromium.org>

|     

|             Reviewed by Kent Tamura.

|     

|             crash when focus is changed while trying to focus next element

|             https://bugs.webkit.org/show_bug.cgi?id=40407

|     

|             * fast/events/focus-change-crash-expected.txt: Added.

|             * fast/events/focus-change-crash.html: Added.

|     2010-06-10  Tony Chang  <to...@chromium.org>

|     

|             Reviewed by Kent Tamura.

|     

|             crash when focus is changed while trying to focus next element

|             https://bugs.webkit.org/show_bug.cgi?id=40407

|     

|             Test: fast/events/focus-change-crash.html

|     

|             * dom/Element.cpp:

|             (WebCore::Element::focus):

|     

|     git-svn-id: svn://svn.chromium.org/blink/trunk@60984 bbb929c8-8fbe-4397-9dbb-9b2b20218538

`----

Notice that the BUG=49317 line is missing from the git commit message.  

Can anyone provide an insight for me as to why this would happen?