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This doesn't work on Python 3.4 on a Mac with Yosemite and Chrome installed:
import webbrowser
webbrowser.get("chrome")
This patch makes it work:
```
*** /usr/local/pythonz/pythons/CPython-3.4.1/lib/python3.4/webbrowser.py	2014年09月21日 16:37:46.000000000 -0400
--- /Users/ned/foo/webbrowser.py	2015年06月14日 17:31:28.000000000 -0400
***************
*** 605,614 ****
--- 605,615 ----
 # Don't clear _tryorder or _browsers since OS X can use above Unix support
 # (but we prefer using the OS X specific stuff)
 register("safari", None, MacOSXOSAScript('safari'), -1)
 register("firefox", None, MacOSXOSAScript('firefox'), -1)
+ register("chrome", None, MacOSXOSAScript('chrome'), -1)
 register("MacOSX", None, MacOSXOSAScript('default'), -1)
 # OK, now that we know what the default preference orders for each
 # platform are, allow user to override them with the BROWSER variable.
```

I must add that it doesn't work on Windows 7, Python 3.4.3, either. I do have chrome.exe on the %PATH% and executing 'chrome' in Windows Command Prompt opens up the Chrome browser nicely, but it doesn't work so nicely by doing this:
import webbrowser
webbrowser.get("chrome")
I get this error message:
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "C:\Program Files\Python 3.4\lib\webbrowser.py", line 51, in get
 raise Error("could not locate runnable browser")
webbrowser.Error: could not locate runnable browser

Boštjan Mejak the windows issue has been addressed in issue 8232 and recently patched for 3.5. http://bugs.python.org/issue8232 

Well... I created a patch based on Ned's code :)
This now works in the default branch
Python 3.7.0a0 (default:f2204eaba685+, Oct 5 2016, 20:43:44) 
[GCC 4.2.1 Compatible Apple LLVM 7.3.0 (clang-703.0.31)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import webbrowser
>>> webbrowser.get("chrome")
<webbrowser.MacOSXOSAScript object at 0x10adc7398>
>>> webbrowser.open_new("https://www.python.org")
True
Please review :)

The patch looks good to me. 
(The test coverage for chrome browser can be improved. But that seems a like a different change than the current one).

OK, this seems to work for me. I'm, applying this to 3.5, 3.6 and 3.7 (default).

New changeset bd0f502c5eea by Guido van Rossum in branch '3.5':
Issue #24452: Make webbrowser support Chrome on Mac OS X.
https://hg.python.org/cpython/rev/bd0f502c5eea
New changeset 64a38f9aee21 by Guido van Rossum in branch '3.6':
Issue #24452: Make webbrowser support Chrome on Mac OS X (merge 3.5->3.6)
https://hg.python.org/cpython/rev/64a38f9aee21 

New changeset 4e2cce65e522 by Guido van Rossum in branch 'default':
Issue #24452: Make webbrowser support Chrome on Mac OS X (merge 3.6->3.7)
https://hg.python.org/cpython/rev/4e2cce65e522 

I applied this to 3.5, 3.6 and 3.7. I'm not sure we should also apply this to 2.7 -- optinions? Bug or feature?

The documentation seems to indicate that chrome MacOS is supposed to work in 2.7, which makes this a bug.
https://docs.python.org/2.7/library/webbrowser.html?highlight=webbrowser#module-webbrowser
But... it could also be a documentation bug.

Applying on 2.7 seems alright. Bug fix.

OK will do.

New changeset bc8a4b121aec by Guido van Rossum in branch '2.7':
Issue #24452: Make webbrowser support Chrome on Mac OS X (backport to 2.7)
https://hg.python.org/cpython/rev/bc8a4b121aec 

Thanks everyone! Applied to 2.7, so closing as fixed now.

New changeset 0c8270cbdc62 by Brett Cannon in branch 'default':
Issue #24452: add attribution
https://hg.python.org/cpython/rev/0c8270cbdc62 

I have Windows 10, 64-bit, and Python 3.6.1, 64-bit, and the code still does not work!
>>> import webbrowser
>>> webbrowser.get("chrome")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "C:\Program Files\Python 3.6\lib\webbrowser.py", line 51, in get
 raise Error("could not locate runnable browser")
webbrowser.Error: could not locate runnable browser
Note: Yes, my Google Chrome browser was running when this command was executed.

Hi Boštjan Mejak, this ticket addresses the change for MacOS.
The windows support is in http://bugs.python.org/issue8232. Please raise the issue there. Thanks.